@@ -40,6 +40,9 @@ Top JavaScript interview questions
4040| 32 | [ What is strict mode in javaScript] ( #32-what-is-strict-mode-in-javascript ) |
4141| 33 | [ What are the different ways to empty an array in javascript] ( #33-what-are-the-different-ways-to-empty-an-array-in-javascript ) |
4242| 34 | [ What is NaN in javascript] ( #34-what-is-nan-in-javascript ) |
43+ | 35 | [ Javascript naming convention] ( #35-javascript-naming-convention ) |
44+ | 36 | [ Difference between call(), apply() and bind()] ( difference-between-call-apply-and-bind ) |
45+ 4346
4447### 1. What is JavaScript
4548* JavaScript is a scripting language used to create dynamic and interactive websites. It is supported by all major web browsers.
@@ -505,6 +508,69 @@ console.log("a"/1) // output ========> NaN
505508console .log (Math .sqrt (- 1 )); // output ========> NaN
506509console .log (parseInt (" blabla" // output ========> NaN
507510` ` `
511+
512+ ### 35. Javascript naming convention
513+ 1. Use camelCase (lowercase for the first word, then uppercase for subsequent words) for variable and function names
514+ 2. Use PascalCase for class names (uppercase for the first letter of each word)
515+ 3. Use "is" or "has" as prefixes for boolean variables
516+ 4. Use UPPERCASE for constants
517+ 5. Use descriptive and meaningful names for your variables, functions, and classes.
518+
519+ ` ` `
520+ // variable
521+ let firstName = " Surbhi"
522+ 523+ // function
524+ function displayName () {
525+ return " Surbhi Dighe"
526+ }
527+ displayName ();
528+ 529+ // boolean
530+ let isLoading = false ;
531+ let hasName = true ;
532+ 533+ // constants
534+ let SECONDS = 60 ;
535+ 536+ // class
537+ class DisplayName {
538+ constructor (firstName , lastName ) {
539+ this .firstName = firstName;
540+ this .lastName = lastName;
541+ }
542+ }
543+ var name = new DisplayName (' Surbhi' ' Dighe'
544+ ` ` `
545+
546+ ### 36. Difference between call(), apply() and bind()
547+ call(), apply(), and bind() methods are used to attach a function into an object and call the function as if it belonged to that object.
548+
549+ **call()** - call() is used to invoke a function immediately with a specified *this* value and allows you to pass the arguments one by one
550+ ` ` `
551+ let person = {name: ' Surbhi'
552+ function printName (message ) {
553+ console .log (message + ' ' + this .name ); // output ========> "Hello Surbhi"
554+ }
555+ printName .call (person, ' Hello'
556+ ` ` `
557+ **apply()** - apply() is used to invoke a function immediately with a specified *this* value and allows you to pass the arguments as an array
558+ ` ` `
559+ let person = {name: ' Surbhi'
560+ function printName (message ) {
561+ console .log (message + ' ' + this .name ); // output ========> "Hello Surbhi"
562+ }
563+ printName .apply (person, [' Hello'
564+ ` ` `
565+ **bind()** - bind() returns a new function (which can be invoked anytime), with a specified *this* value and allows you to pass in arguments
566+ ` ` `
567+ let person = {name: ' Surbhi'
568+ function printName (message ) {
569+ console .log (message + ' ' + this .name ); // output ========> "Hello Surbhi"
570+ }
571+ let sayHello = printName .bind (person, " Hello"
572+ sayHello ();
573+ ` ` `
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