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To check if a variable is an array in JavaScript, you can use the Array.isArray() method.
let myVariable = [1, 2, 3];
let isItArray = Array.isArray(myVariable);
console.log(isItArray);
// Output: true
The typeof operator in JavaScript is used to determine the data type of a variable or an expression.
let x = 10;
let y = "Hello";
console.log(typeof x);
// Output: "number"
console.log(typeof y);
// Output: "string"
In JavaScript, keys in an array are the numeric indices used to access its elements. Arrays start counting from 0, so the first element is at index 0, the second at index 1, and so on.
let myArray = [10, 20, 30];
console.log(myArray[0]);
// Output: 10
split() method in JavaScript -
Ans - split() method is used to split a string into an array of substring.
Just Screen Recorded a JavaScript Method for you guys. Hope you learn something from this.
#JavaScript #js
JavaScript Complete free Resources
1/ Websites:
π http://freecodecamp.org
π http://javascript.info
π http://javascriptquiz.com
π http://developer.mozilla.org
π http://eloquentjavascript.net
π http://w3schools.com
π http://khanacademy.org
π http://codecademy.com
π http://learn-js.org
2/ Books:
π Eloquent JavaScript
π JavaScript: The good parts
π Learn JavaScript visually
π JavaScript: The definitive guide
π A smarter way to learn JavaScript
π You Don't Know JS
π Effective JavaScript
π Speaking JavaScript
3/ YouTube Channels:
βΆοΈ Traversy Media
βΆοΈ Programming with Mosh
βΆοΈ Web Dev Simplified
βΆοΈ Academind
βΆοΈ Fireship
βΆοΈ Dev Ed
4/ Podcasts:
π» Syntax
π» JavaScript Jabber
π» Modern Web
π» Full-stack radio
π» Codepen Radio
π» ShopTalk
π» JAMstack Radio
5/ Coding Challenge Platforms:
𧩠http://codewars.com
𧩠http://codingame.com
𧩠http://coderbyte.com
𧩠http://exercism.io
𧩠http://edabit.com
6/ Mobile Apps:
π± SoloLearn
π± Codemurai
π± Mimo
π± Grasshopper
π± Programming Hero
π± Programming Hub
Angular 17 and the new angular.dev site has been officially released.
How to particularly check if a variable is array in JavaScript?
What is typeOf operator in JavaScript?
What are keys in array in JavaScript?
What is the behavior of the following JavaScript function?
function someFunction(n) { while (true) { console.log(n); } }
I will post small byte sized topics for you everyday. π read π them and learn them...
Correct answer is:
["Orange", "Lemon"]
Why? -
Answer- The slice() method in JavaScript extracts a section of array.
Here fruits.slice(1, 3) will start extracting the elements from index 1 upto index 3.
However index 3 element will not be included in the returned array by splice method.
Questions arises- what is array?
What is index in array?
What will be the Output?
const fruits = ["Banana", "Orange", "Lemon", "Apple", "Mango"];
const citrus = fruits.slice(1, 3);
Web Development CS JS Python JavaScript Hacking ReactJs Python django Flask CSS Frontend Backend Full Stack Java Node Pdf Books:
Chat group link
https://t.me/+2KE896TMwHkxOWE1
Resources aka PDfs and Ebooks group link
https://t.me/+eweUkdFwlho4YjRl
ππ don't leave this group, i will share items here π
