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Commit e9105b7b authored by Andrej Rasevic's avatar Andrej Rasevic
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adding week1 material

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codeExamples/week1/introductionToJavascript-1/arraySlice.html 0 → 100644
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>Array Slice Example</title>
</head>
<body>
<script>
"use strict";
var arr = new Array();
arr.push({
name: 'Maryland'
});
arr.push({
name: 'Virginia'
});
arr.push({
name: 'Delaware'
});
document.writeln("Before modification<br>");
var sliced = arr.slice(1, 3); // only DE and VA
printArray(arr);
printArray(sliced);
document.writeln("<br>");
sliced[0].name = 'Texas';
document.writeln("After modification<br>");
/* note that both arrays have Texas. It's shallow copy */
printArray(arr);
printArray(sliced);
function printArray(data) {
var i;
for (i = 0; i < data.length; i++) {
document.writeln(data[i].name + " ");
}
document.writeln("<br>");
}
function main() {
var languages = ["JavaScript", "Java", "PHP", "Python"];
document.writeln(languages + "<br>")
document.writeln("Length: " + languages.length + "<br>");
document.writeln("<br>");
languages.push("C");
document.writeln("After pushing element<br>");
printArray(languages);
var retrieved = languages.pop();
document.writeln("Popped element: " + retrieved + "<br>");
document.writeln("After popping element<br>");
printArray(languages);
document.writeln("<br>");
var retrieved = languages.shift();
document.writeln("Shifted element: " + retrieved + "<br>");
document.writeln("After shifting<br>");
printArray(languages);
document.writeln("After unshifting<br>");
languages.unshift(retrieved);
printArray(languages);
document.writeln("<br>");
document.writeln("Finding index of \"Python\": ");
document.writeln(languages.indexOf("Python") + "<br>");
document.writeln("Finding index of \"C\": ");
document.writeln(languages.indexOf("C") + "<br>");
document.writeln("<br>");
document.writeln("Before removing elements with splice<br>");
printArray(languages);
// returns removed elements array
var removedElements = languages.splice(1, 2);
document.writeln("After removing elements with splice<br>");
printArray(languages);
document.writeln("Elements removed<br>");
printArray(removedElements);
document.writeln("<br>");
languages.splice(1, 0, "Go", "C++", "Ruby");
document.writeln("After adding 3 elements with splice<br>");
printArray(languages);
document.writeln("<br>");
document.writeln("slice example<br>");
var shallowCopy = languages.slice();
document.writeln("Shallow copy<br>");
printArray(shallowCopy);
shallowCopy[1] = "Perl";
printArray(shallowCopy);
printArray(languages); // String is primitives.
document.writeln("<br>");
var seasons = ["Fall", "Winter", "Spring", "Summer"];
seasons.reverse();
document.writeln("After reversing array<br>");
printArray(seasons);
document.writeln("<br>");
var part1 = [10, 20, 30];
var part2 = [40, 50, 60];
var part3 = part1.concat(part2);
document.writeln("After concatenating<br>");
printArray(part3);
document.writeln("<br>");
document.writeln("After fill<br>");
var filled = new Array(4).fill(100);
printArray(filled);
document.writeln("<br>");
document.writeln("Devices<br>");
var devices = ["Computer", "Clock", "Generator"];
devices[7] = "Phone";
devices.forEach(function (elem, index) {
document.writeln("Index: " + index + ", Elem: " + elem + "<br>");
});
}
</script>
</body>
</html>
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codeExamples/week1/introductionToJavascript-1/arraysLengthProp.html 0 → 100644
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Arrays Length Property</title>
</head>
<body>
<script>
"use strict";
main();
function main() {
var languages = ["English", "Spanish", "French"];
printArray(languages);
document.writeln("Length: " + languages.length + "<br>");
// see what values are used for the elements in the middle
languages[8] = "Italian";
document.writeln("After adding Italian<br>");
printArray(languages);
document.writeln("Keys<br>");
// The Object.keys() method returns an array of a given
// object's own enumerable property names, in the same order as
// we get with a normal loop.
document.writeln(Object.keys(languages) + "<br>");
document.writeln("Length: " + languages.length + "<br>");
languages.length = 2;
document.writeln("After changing length<br>");
printArray(languages);
}
function printArray(data) {
var i;
for (i = 0; i < data.length; i++) {
document.writeln(data[i] + " ");
}
document.writeln("<br>");
}
</script>
</body>
</html>
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codeExamples/week1/introductionToJavascript-1/arraysOneDim.html 0 → 100644
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Arrays</title>
</head>
<body>
<script>
"use strict";
main();
function main() {
var numOfBeds = 4;
var roomNumber = reserveRoom(numOfBeds);
printRoom(roomNumber);
cleanRoom(roomNumber);
printRoom(roomNumber);
}
function reserveRoom(numberOfBeds) {
var roomNumber = new Array(numberOfBeds);
for (var idx = 0; idx < roomNumber.length; idx++) {
roomNumber[idx] = "Bed" + idx;
}
return roomNumber;
}
function printRoom(roomNumberParameter) {
for (var idx = 0; idx < roomNumberParameter.length; idx++) {
document.writeln(roomNumberParameter[idx] + "<br>");
}
}
function cleanRoom(roomNumberParameter) {
for (var idx = 0; idx < roomNumberParameter.length; idx++) {
roomNumberParameter[idx] += " cleaned ";
}
}
</script>
</body>
</html>
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codeExamples/week1/introductionToJavascript-1/arraysTwoDim.html 0 → 100644
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Two-Dimensional Arrays</title>
</head>
<body>
<script>
"use strict";
main();
function main() {
document.writeln("<h2>First Data Set</h2>");
var firstArray = [
[10, 20, 30],
[40, 50, 60],
[70, 80, 90]
];
printArray(firstArray);
document.writeln("<h2>Second Data Set</h2>");
var secondArray = createArray(2, 3);
initializeArray(secondArray, 1);
printArray(secondArray);
document.writeln("<h2>Third Data Set (Ragged Array)</h2>");
var thirdArray = [
[100, 200, 300],
[400],
[700, 800],
[],
[500, 600, 900, 1000]
];
printArray(thirdArray);
}
function createArray(maxRows, maxCols) {
var newArray = new Array(maxRows);
for (var row = 0; row < maxRows; row++) {
newArray[row] = new Array(maxCols);
}
return newArray;
}
function initializeArray(data, initialValue) {
var row, col;
for (row = 0; row < data.length; row++) {
for (col = 0; col < data[row].length; col++) {
data[row][col] = initialValue;
initialValue++;
}
}
}
function printArray(data) {
var row, col;
for (row = 0; row < data.length; row++) {
for (col = 0; col < data[row].length; col++) {
document.writeln(data[row][col] + "&nbsp;&nbsp;");
}
document.writeln("<br>"); // why do we need this?
}
}
</script>
</body>
</html>
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codeExamples/week1/introductionToJavascript-1/arrowFunc.html 0 → 100644
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>JS Example</title>
</head>
<body>
<script>
"use strict";
let prod2 = x => x * 2;
let sum = (x, y, z) => x + y + z;
let initialValue = () => 1000;
let formatted = x => {
x++;
return `Value: ${x}`;
}
document.writeln(prod2(10) + "<br>");
document.writeln(sum(10, 2, 4) + "<br>");
document.writeln(initialValue() + "<br>");
document.writeln(formatted(5) + "<br>")
let scores = [10, 1, 44, 200];
let sortedAttempt1 = scores.sort();
document.writeln("sortedAttempt1: " + sortedAttempt1 + "<br>");
let sortedAttempt2 = scores.sort((a, b) => a - b);
document.writeln("sortedAttempt2: " + sortedAttempt2 + "<br>");
</script>
</body>
</html>
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codeExamples/week1/introductionToJavascript-1/arrowFunc2.html 0 → 100644
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>JS Example</title>
</head>
<body>
<script>
// strict mode is disabled intentionally
// "use strict";
// source:
// https://blog.bitsrc.io/a-practical-guide-to-es6-arrow-functions-c16975100cf5
const details = {
name: 'Arfat',
getName: function () {
return this.name;
}
}
details.getName(); // 'Arfat'
// However, in JavaScript, the callback function (and every traditional function)
// gets its own value of this. This value is different from the details object.
// Hence, the getDetails methods has a value of this that is bound to details
// object, and the callback passed to the forEach method has a value of this that
// is not details object. When the callback is searching for the this value, it
// invariably gets its own value first instead of the this value of getFriends
// method. In a sense, the this value of getFriends is shadowed by the callback’s
// own value.
const details2 = {
name: 'Arfat',
friends: ['Bob', 'Alex'],
getFriends: function () {
this.friends.forEach(function (friend) {
console.log(this.name + " is friends with " + friend);
});
}
}
details2.getFriends();
// One solution is to this problem is to use the that = this pattern. Let’s see
// the code
const details3 = {
name: 'Arfat',
friends: ['Bob', 'Alex'],
getFriends: function () {
const that = this;
this.friends.forEach(function (friend) {
console.log(that.name + " is friends with " + friend);
});
}
}
details3.getFriends();
// manual rebinding of this
const details4 = {
name: 'Arfat',
friends: ['Bob', 'Alex'],
getFriends: function () {
this.friends.forEach(function (friend) {
console.log(this.name + " is friends with " + friend);
}, this);
}
}
details4.getFriends();
// Arrow functions bind this lexically. In other words, Arrow functions always
// have a value of this keyword taken from the parent scope. That is, they don’t
// have any intrinsic, own this value.
const details5 = {
name: 'Arfat',
friends: ['Bob', 'Alex'],
getFriends: function () {
this.friends.forEach(friend => {
console.log(this.name + " is friends with " + friend);
});
}
}
details5.getFriends();
</script>
</body>
</html>
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codeExamples/week1/introductionToJavascript-1/defaultParameters.html 0 → 100644
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>JS Example</title>
</head>
<body>
<script>
"use strict";
main();
function main() {
task();
task("Rose");
task(25);
task("Kelly", 30, 20000);
taskOld();
document.writeln(greet('Hello', 'Chris'));
}
function task(name = "John", age = 21, salary = special()) {
document.writeln(name + ' ' + age + ' ' + salary + "<br>");
}
function taskOld(name, age) {
name = name || "John";
age = age || 21;
document.writeln("Old approach: " + name + ' ' + age + "<br>");
}
function special() {
return 10000;
}
// Parameters defined beforehand (to the left) are available to later
// default parameters
function greet(name, greeting, message = greeting + ' ' + name) {
return [name, greeting, message];
}
</script>
</body>
</html>
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codeExamples/week1/introductionToJavascript-1/definingFunctions.html 0 → 100644
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>JS Example</title>
</head>
<body onload="main()">
<script>
main();
function main() {
document.writeln(product(3, 4));
/* Function expression (anonymous function) */
var myProduct = function (x, y) {
return x * y;
};
document.writeln("<br>" + myProduct(100, 200));
/* Using Function constructor */
var thirdProduct = new Function("x", "y", "return x * y");
document.writeln("<br>" + thirdProduct(2, 3));
}
/* Function declaration */
function product(x, y) {
return x * y;
}
</script>
</body>
</html>
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codeExamples/week1/introductionToJavascript-1/destructuring.html 0 → 100644
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>JS Destructuring Example</title>
</head>
<body>
<script>
"use strict";
main();
function main() {
/* destructuring arrays */
let names = ["John", "Mary", "Paul"];
let [first, second] = names;
document.writeln("First: " + first + ", " + "Second: " + second + "<br>");
/* destructuring objects */
let app = {
name: "mapApp",
developed: 1986
};
/* You must use the same property name; try name2 instead of name */
let {
name,
developed
} = app; /* Notice using { } */
document.writeln("Name: " + name + ", " + "Developed: " + developed + "<br>");
/* swap */
let a = 100,
b = 200;
[b, a] = [a, b];
document.writeln(a + ", " + b + "<br>");
let [x, y, ...rest] = [10, 20, 30, 40, 50];
document.writeln(x + ", " + y + ", [" + rest + "]");
}
</script>
</body>
</html>
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codeExamples/week1/introductionToJavascript-1/forOf.html 0 → 100644
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>JS Example</title>
</head>
<body>
<script>
"use strict";
let languages = ["C++", "Fortran", "JavaScript"];
for (let lang of languages) {
document.writeln(lang + "<br>");
}
</script>
</body>
</html>
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codeExamples/week1/introductionToJavascript-1/functionsAsData.html 0 → 100644
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<!doctype html>
<html>
<head>
<meta charset="UTF-8" />
<title>Functions as Data</title>
</head>
<body>
<script>
"use strict";
main();
function main() {
var sayHi = hello;
var hi = hello;
hi("John");
hello("John");
sayHi("John");
}
function hello(name) {
document.writeln(name + "<br />");
}
</script>
</body>
</html>
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codeExamples/week1/introductionToJavascript-1/functionsAsData2.html 0 → 100644
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>Functions as Data</title>
</head>
<body>
<script>
"use strict";
main();
function main() {
var numberOfValues = Number(prompt("Enter number of values to print"));
var wantHTML = window.confirm(
"Press OK for HTML format and Cancel for text");
var printingFunction;
if (wantHTML) {
//processValues(numberOfValues, htmlFormat);
printingFunction = htmlFormat;
} else {
//processValues(numberOfValues, textFormat);
printingFunction = textFormat;
}
processValues(numberOfValues, printingFunction);
}
function textFormat(data) {
document.writeln(data);
}
function htmlFormat(data) {
document.writeln("<em><strong>" + data + ", </strong></em>");
}
function processValues(maximum, printOption) {
var curr = 1;
while (curr <= maximum) {
printOption(curr);
curr++;
}
}
</script>
</body>
</html>
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codeExamples/week1/introductionToJavascript-1/instanceOf.html 0 → 100644
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<!doctype html>
<html>
<head>
<meta charset="UTF-8" />
<title>charAt Example</title>
</head>
<body>
<script>
"use strict";
main();
function printArray(scores) {
var i;
for (i = 0; i < scores.length; i++) {
document.writeln("Value " + scores[i] + "<br>");
}
}
function main() {
var myInfo = {
name: "John",
id: 10
};
var scores = [10, 30];
printArray(scores);
document.writeln("myInfo instance of Object: " + (myInfo instanceof Object) +
"<br>");
document.writeln("scores instance of Object: " + (scores instanceof Object) +
"<br>");
document.writeln("scores instance of Array: " + (scores instanceof Array) + "<br>");
document.writeln("printArray instance of Function: " + (
printArray instanceof Function) + "<br><br>");
document.writeln("typeof myInfo: " + typeof myInfo + "<br>");
document.writeln("typeof scores: " + typeof scores + "<br>");
document.writeln("typeof printArray: " + typeof printArray + "<br><br>");
document.writeln("Array.isArray(scores): " + Array.isArray(scores) + "<br>");
}
</script>
</body>
</html>
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>Null</title>
</head>
<body>
<script>
"use strict";
main();
function main() {
var name = window.prompt(
"Enter your name (select cancel to see result)");
if (name === null) {
window.confirm("Data input operation cancelled.");
} else {
window.confirm("Welcome: " + name);
}
}
</script>
</body>
</html>
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codeExamples/week1/introductionToJavascript-1/numericValues.html 0 → 100644
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>Numeric Values</title>
</head>
<body>
<script>
"use strict";
var info = "NaN: " + Number.NaN + "<br>";
info += "Infinity: " + Infinity + "<br>";
info += "MAX_VALUE: " + Number.MAX_VALUE + "<br>";
info += "MIN_VALUE: " + Number.MIN_VALUE + "<br>";
info += "POSITIVE_INFINITY: " + Number.POSITIVE_INFINITY + "<br>";
info += "NEGATIVE_INFINITY: " + Number.NEGATIVE_INFINITY + "<br>";
info += "isFinite(100): " + isFinite(100) + "<br>";
info += "isFinite(null): " + isFinite(null) + "<br>";
info += "Number.isFinite(null): " + Number.isFinite(null) + "<br>";
document.writeln(info);
document.writeln("Result of 1/0: " + 1 / 0 + "<br>");
document.writeln("Result of 1/Infinity: " + 1 / Infinity + "<br>");
document.writeln("Result of Infinity/0: " + Infinity / 0 + "<br>");
document.writeln("Result of Infinity/Infinity: " + Infinity / Infinity +
"<br>");
document.writeln("Square root of negative value: " + Math.sqrt(-10) +
"<br>");
document.writeln("Square root of a string: " + Math.sqrt("Rose") + "<br>");
document.writeln("Floating-point values are approximations<br>");
var x = 1 / 7 + 4 / 7 + 2 / 7;
var y = (1 + 4 + 2) / 7;
document.writeln("Value of x: " + x + "<br>");
document.writeln("Value of y: " + y + "<br>");
if (x === y) {
document.writeln("Same value<br>");
} else {
document.writeln("Different values<br>");
}
</script>
</body>
</html>
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>Random Values</title>
</head>
<body>
<script>
"use strict";
main();
function main() {
var maximum, menu = "Enter 1 for random values [0, 1)\n";
menu += "Enter 2 for random values between [0, max)\n";
menu += "Enter 3 for integer Random values between [0, max]";
var choice = Number(prompt(menu));
var numberOfValues = Number(prompt(
"Enter number of values to generate"));
if (choice === 1) {
simpleRandomCall(numberOfValues);
} else if (choice === 2) {
maximum = Number(prompt("Enter maximum value"));
randomValues(maximum, numberOfValues);
} else if (choice === 3) {
maximum = Number(prompt("Enter maximum value"));
randomIntegerValues(maximum, numberOfValues);
} else {
alert("Invalid choice.");
}
}
function simpleRandomCall(numberOfValues) {
document.writeln("<h1>Values between 0 and less than 1</h1>");
document.writeln("<p>");
var i = 0;
while (i < numberOfValues) {
document.writeln(Math.random() + "<br>");
i++;
}
document.writeln("</p>");
}
function randomValues(max, numberOfValues) {
document.writeln("<h1>Random values between 0 and less than " +
max +
" </h1>");
document.writeln("<p>");
var i = 0;
while (i < numberOfValues) {
document.writeln((max * Math.random()) + "<br>");
i++;
}
document.writeln("</p>");
}
function randomIntegerValues(max, numberOfCalls) {
document.writeln("<h1>Random integer values between 0 and " + max +
" </h1>");
document.writeln("<p>");
var i = 0;
while (i < numberOfCalls) {
document.writeln(Math.floor((max + 1) * Math.random()) +
"<br>");
i++;
}
document.writeln("</p>");
}
</script>
</body>
</html>
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>JS Rest Operator Example</title>
</head>
<body>
<script>
"use strict";
main();
function main() {
partyInfo("FirstParty", "John", "Alice", "Peter");
partyInfo("SecondParty", "Mike", "Sandra");
}
function partyInfo(name, director, ...others) {
document.writeln(name + " " + director + "<br>");
for (let i = 0; i < others.length; i++) {
document.writeln(others[i]);
}
document.writeln("<br>");
}
</script>
</body>
</html>
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>Sorting</title>
</head>
<body>
<script>
"use strict";
main();
function printArray(data) {
var i;
for (i = 0; i < data.length; i++) {
document.writeln(data[i] + " ");
}
document.writeln("<br>");
}
function main() {
var names = ["Rose", "Bob", "Tom", "Albert"];
document.writeln("Original<br>");
document.writeln(names.join() + "<br>");
document.writeln("Sorted<br>");
names.sort();
document.writeln(names.join("*") + "<br>");
var scores = [30, 2, 4, 5];
document.writeln("Original<br>");
document.writeln(scores.join() + "<br>");
document.writeln("Sorted<br>");
scores.sort(); // Unicode code point order does generates unexpected result
document.writeln(scores.join(",") + "<br><br>");
document.writeln("Using comparison function<br>");
scores.sort(function (x, y) {
return x - y;
});
document.writeln(scores.join(",") + "<br><br>");
document.writeln("Sorted names<br>");
names.sort(strCompare);
document.writeln(names.join(",") + "<br>");
var students = [{
name: "John",
id: 3
},
{
name: "Peter",
id: 2
},
{
name: "Mary",
id: 10
}
];
document.writeln("Sorting array of objects<br>");
students.sort(function (x, y) {
return strCompare(x.name, y.name);
});
for (let i = 0; i < students.length; i++) {
document.writeln(students[i].name + "<br>");
}
}
function strCompare(x, y) {
if (x < y) {
return -1;
} else if (x > y) {
return 1;
} else {
return 0;
}
}
</script>
</body>
</html>
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codeExamples/week1/introductionToJavascript-1/spreadOperator.html 0 → 100644
+ 58
− 0
View file @ e9105b7b
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>JS Spread Operator Example</title>
</head>
<body>
<script>
"use strict";
function process(start, end, delta, message) {
document.writeln(message + "<br>");
for (let i = start; i <= end; i += delta) {
document.writeln(i + " ");
}
document.writeln("<br>");
}
process(1, 10, 2, "First");
process(...[1, 10, 2, "Second", "Test"]);
/* will not work without spread operator */
process(1, ...[10, 2], "Third"); /* will not work without spread operator */
let part1 = ["C", "Java"];
let part2 = ["Python"];
let combined = ["Pascal", ...part1, ...part2];
document.writeln(combined.join() + "<br>");
var arr = [1, 2, 3];
var arr2 = [...arr]; // like arr.slice()
arr2.push(4);
document.writeln(arr2 + "<br>");
let numArray1 = [1, -21, 3, 4];
let numArray2 = [9, 3, -8, 10, 7];
document.writeln(Math.max(...numArray1, ...numArray2) + "<br>");
let string = "CMSC389N";
let charArr = [...string];
document.writeln(charArr + "<br>");
document.writeln(typeof charArr[0] + "<br>");
let newArr = Array.from(string).map(x => x.toLowerCase());
document.writeln(newArr + "<br>");
document.writeln("Converting elements of iterable into array<br>");
let mySet = new Set();
mySet.add("Mike").add("Rose");
let myArray = [...mySet];
document.writeln(myArray.join());
</script>
</body>
</html>
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codeExamples/week1/introductionToJavascript-1/sqrTable.html 0 → 100644
+ 40
− 0
View file @ e9105b7b
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>Square Root Table</title>
</head>
<body>
<script>
"use strict";
var currValue = 0,
maximumValue;
/* Reading a value from the user and verifying is correct */
do {
maximumValue = Number(prompt("Enter a value"));
if (maximumValue < 0)
alert("Invalid value: " + maximumValue);
} while (maximumValue < 0);
/* Generating the table */
// document.writeln writes a string of text followed by a newline
// character to a document. Try also document.write(...)
document.writeln("<table border=\"10\">");
document.writeln("<caption><strong>Square Root Table</strong></caption>");
document.writeln("<tr><th>Number</th><th>Square Root</th></tr>");
while (currValue <= maximumValue) {
document.writeln("<tr><td>" + currValue + "</td><td>" +
Math.sqrt(currValue) + "</td></tr>");
currValue = currValue + 1;
}
document.writeln("</table>");
</script>
</body>
</html>
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