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KatabathulaKatabathula
Katabathula
authored and
Katabathula
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general javascript learnings
1 parent cc85a49 commit 433c9dc

12 files changed

+179
-22
lines changed

‎.gitignore

+1
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.vscode/

‎arguments-length-changes.js

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function argumentTest(a, b, c) {
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console.log(arguments.length, ' :: ', arguments);
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}
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argumentTest();
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argumentTest('a');
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argumentTest('a', 'b');
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argumentTest('a', 'b', 'c');
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argumentTest('a', 'b', 'c', 'd');

‎const-scenarios.js

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const stringConstant = "Constant";
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const arrayConstant = ["s1","s2","s3","S4"];
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const objectConstant = {
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"key1":"val1",
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"key2":"val2",
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"key3":"val3",
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"key4":"val4"
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};
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const integerConstant = 2;
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console.log("*********************Initial values**********************");
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console.log("integerConstant : ",integerConstant);
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console.log("stringConstant : ",stringConstant);
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console.log("arrayConstant : ",arrayConstant);
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console.log("objectConstant : ",objectConstant);
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// stringConstant = "testChange"; // throws error as assignment is not permitted
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// integerConstant = 3; // throws error as assignment is not permitted
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// arrayConstant = [1,2,3,4]; // throws error as assignment is not permitted
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// objectConstant = {"key1":"val2"}; // throws error as assignment is not permitted
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// arrayConstant[0]="string1"; // Allowed since we are just changing a single value of arrayConstant
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arrayConstant[0]=objectConstant; // Allowed since we are just changing a single value of arrayConstant
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objectConstant["key1"] =stringConstant; // Allowed since we are just changing a single value of objectConstant
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console.log("\n\n*********************After changes***********************");
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console.log("integerConstant : ",integerConstant);
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console.log("stringConstant : ",stringConstant);
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console.log("arrayConstant : ",arrayConstant);
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console.log("objectConstant : ",objectConstant);

‎ds/arguments.js

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function arguments() {
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}
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function magicCalc(init) {
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this.add = function (argument) {
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if (!init)
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this.init = 0;
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typeof (argument) === 'number'
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? init += argument
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: ((typeof (argument) === 'array')
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? argument.reduce(function (sum, value) { }, this.init)
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: this.init
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);
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return this;
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}
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}
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console.log(new magicCalc(0).add([1]));

‎ds/chaining.js

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let Calculator = function (init) {
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this.add = function (x) {
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init += x;
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return this;
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}
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this.multiply = function (x) {
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init *= x;
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return this;
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}
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this.print = function () {
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console.log(init);
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}
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}
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new Calculator(0).add(1).add(2).print();

‎for-each-vs-map.js

+2-12
Original file line numberDiff line numberDiff line change
@@ -5,23 +5,13 @@ a = a.map(element => {
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console.log(element);
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element = element * 2;
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return element;
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// return is required because map creates a new array pushing the values returned
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});
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1011
b.forEach((element) => {
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element *= 2;
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// return element;
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// no need to return as the elements get updated automatically
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});
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console.log('a : ', a);
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console.log('b : ', b);
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// for (let test of a) {
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// console.log(' of : ',test);
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// }
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// for (let test in a) {
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// console.log(' in : ', test);
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// }
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// a = { test: 1, test2: 2, test3: 3, test4: 4 };
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// for(let test of a) {
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// console.log(' of : ',test);
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// }

‎let-vs-var.js

+4-4
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@@ -1,4 +1,4 @@
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let a = function() {
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let letFunc = function() {
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let a = 7, b =[];
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for(var i =0;i<a;i++) {
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b.push(()=>{
@@ -10,7 +10,7 @@ let a = function() {
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});
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}
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};
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let a2 = function () {
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let varFunc = function () {
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let a = 7, b = [];
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for (var i = 0; i < a; i++) {
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b.push(() => {
@@ -24,8 +24,8 @@ let a2 = function () {
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}
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};
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27-
let letFunc = a2,varFunc = a;
27+
// let letFunc = a2,varFunc = a;
2828
console.log('var one');
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letFunc.print();
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console.log('let one');
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varFunc.print();
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varFunc.print();

‎object-creation.js

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let obj1 = new Object();
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console.log(obj1);
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let obj2 = {};
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console.log(obj2);
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console.log(obj1 == obj2);
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console.log(obj1 === obj2);

‎object-ref-vs-clone.js

Whitespace-only changes.

‎strings-reference.js

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let a = "goku", b = "goku";
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console.log('a : ', a);
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console.log('b : ', b);
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b = "vegeta";
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console.log('after b = "vegita"');
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console.log('a : ', a);
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console.log('b : ', b);
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b = a;
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console.log('after b = a');
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console.log('a : ', a);
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console.log('b : ', b);
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a = "vegito";
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console.log('after a = "vegito"');
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console.log('a : ', a);
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console.log('b : ', b);
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b="buu";
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console.log('after setting b to max')
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console.log('a : ', a);
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console.log('b : ', b);

‎test-string-pool.js

-6
This file was deleted.

‎types/basic-types.js

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let str = '1', num = 2;
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let boolTrue = true, boolFalse = false;
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console.log('**** String and Number ****');
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console.log('----------------------------');
5+
console.log('\'1\' + 2 :: ', str + num);
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console.log('\'1\' - 2 :: ', str - num);
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console.log('\'1\' * 2 :: ', str * num);
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console.log('\'1\' / 2 :: ', str / num);
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console.log('\'1\' % 2 :: ', str % num);
10+
11+
console.log('\n**** Number and String ****');
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console.log('-----------------------------');
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console.log('2 + \'1\' :: ', num + str);
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console.log('2 - \'1\' :: ', num - str);
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console.log('2 * \'1\' :: ', num * str);
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console.log('2 / \'1\' :: ', num / str);
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console.log('2 % \'1\' :: ', num % str);
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19+
console.log('\n*** Number and True ***');
20+
console.log('----------------------------');
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console.log('2 + true :: ', num + boolTrue);
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console.log('2 + true :: ', num + boolTrue);
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console.log('2 + true :: ', num + boolTrue);
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console.log('2 + true :: ', num + boolTrue);
25+
console.log('2 + true :: ', num + boolTrue);
26+
27+
console.log('\n*** Number and False ***');
28+
console.log('----------------------------');
29+
console.log('2 + false :: ', num + boolFalse);
30+
console.log('2 - false :: ', num - boolFalse);
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console.log('2 * false :: ', num * boolFalse);
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console.log('2 / false :: ', num / boolFalse);
33+
console.log('2 % false :: ', num % boolFalse);
34+
35+
console.log('\n*** String and boolean ***');
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console.log('----------------------------');
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console.log('**** true and String ****');
38+
console.log('-------------------------');
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console.log('true + \'1\'', boolTrue + str);
40+
console.log('true - \'1\'', boolTrue - str);
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console.log('true * \'1\'', boolTrue * str);
42+
console.log('true / \'1\'', boolTrue / str);
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console.log('true % \'1\'', boolTrue % str);
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45+
console.log('**** false and String ****');
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console.log('-------------------------');
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console.log('false + \'1\'', boolFalse + str);
48+
console.log('false - \'1\'', boolFalse - str);
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console.log('false * \'1\'', boolFalse * str);
50+
console.log('false / \'1\'', boolFalse / str);
51+
console.log('false % \'1\'', boolFalse % str);
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53+
console.log('\n*** Boolean Operations ***');
54+
console.log('============================');
55+
console.log('\n**** true and false ****');
56+
console.log('--------------------------');
57+
console.log('true + false :: ', boolTrue + boolFalse);
58+
console.log('true - false :: ', boolTrue - boolFalse);
59+
console.log('true * false :: ', boolTrue * boolFalse);
60+
console.log('true / false :: ', boolTrue / boolFalse);
61+
console.log('true + false :: ', boolTrue + boolFalse);
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63+
console.log('\n**** All true Operations ****')
64+
console.log('-------------------------------');
65+
console.log('true + true :: ', boolTrue + boolTrue);
66+
console.log('true - true :: ', boolTrue - boolTrue);
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console.log('true * true :: ', boolTrue * boolTrue);
68+
console.log('true / true :: ', boolTrue / boolTrue);
69+
console.log('true % true :: ', boolTrue % boolTrue);
70+
71+
console.log('\n**** All false Operations ****')
72+
console.log('--------------------------------');
73+
console.log('false + false :: ', boolFalse + boolFalse);
74+
console.log('false - false :: ', boolFalse - boolFalse);
75+
console.log('false * false :: ', boolFalse * boolFalse);
76+
console.log('false / false :: ', boolFalse / boolFalse);
77+
console.log('false % false :: ', boolFalse % boolFalse);

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