JAVASCRIPT

methods of javascript array

[1, 2, 3].push(4); // [1, 2, 3, 4]
[1, 2, 3].pop(); // [1, 2]
[1, 2, 3].shift(); // [2, 3]
[1, 2, 3].unshift(0); // [0, 1, 2, 3]
['a', 'b'].concat('c'); // ['a', 'b', 'c']
['a', 'b', 'c'].join('-'); // a-b-c
['a', 'b', 'c'].slice(1); // ['b', 'c']
['a', 'b', 'c'].indexOf('b'); // 1
['a', 'b', 'c'].includes('c'); // true
[3, 5, 6, 8].find((n) => n % 2 === 0); // 6
[2, 4, 3, 5].findIndex((n) => n % 2 !== 0); // 2
[3, 4, 8, 6].map((n) => n * 2); // [6, 8, 16, 12]
[1, 4, 7, 8].filter((n) => n % 2 === 0); // [4, 8]
[2, 4, 3, 7].reduce((acc, cur) => acc + cur); // 16
[2, 3, 4, 5].every((x) => x < 6); // true
[3, 5, 6, 8].some((n) => n > 6); // true
[1, 2, 3, 4].reverse(); // [4, 3, 2, 1]
[3, 5, 7, 8].at(-2); // 7

array method

function square(arr) {
       const newArr = arr.map(x => x * x );
    return newArr ;
  
  //if you find this answer is useful ,
//upvote ⇑⇑ , so can the others benefit also . @mohammad alshraideh ( ͡~ ͜ʖ ͡°)

JavaScript Array Methods

let dailyActivities = ['sleep', 'work', 'exercise']
let newRoutine = ['eat'];

// sorting elements in the alphabetical order
dailyActivities.sort();
console.log(dailyActivities); // ['exercise', 'sleep', 'work']

//finding the index position of string
const position = dailyActivities.indexOf('work');
console.log(position); // 2

// slicing the array elements
const newDailyActivities = dailyActivities.slice(1);
console.log(newDailyActivities); // [ 'sleep', 'work']

// concatenating two arrays
const routine = dailyActivities.concat(newRoutine);
console.log(routine); // ["exercise", "sleep", "work", "eat"]

array methods in javascript

[1, 2, 3].push(4); // [1, 2, 3, 4]
[1, 2, 3].pop(); // [1, 2]
[1, 2, 3].shift(); // [2, 3]
[1, 2, 3].unshift(0); // [0, 1, 2, 3]
['a', 'b'].concat('c'); // ['a', 'b', 'c']
['a', 'b', 'c'].join('-'); // a-b-c
['a', 'b', 'c'].slice(1); // ['b', 'c']
['a', 'b', 'c'].indexOf('b'); // 1
['a', 'b', 'c'].includes('c'); // true
[3, 5, 6, 8].find((n) => n % 2 === 0); // 6
[2, 4, 3, 5].findIndex((n) => n % 2 !== 0); // 2
//Answer by Anshul soni
//Visit my website- https://anshulsoni.netlify.app/

Array Methods

//ADD ELEMENTS
//PUSH - adds elements to the END OF ARRAY
const friends = ["Zizi", "Ioseb", "Maiko"];
const newLength = friends.push("Karina");
console.log(friends); //["Zizi", "Ioseb", "Maiko"]
console.log(newLenght); //["Zizi", "Ioseb", "Maiko", "Karina"]

//UNSHIFT - add elements to BEGINNING OF THE ARRAY
friends.unshift("Baqso");
console.log(friends); //["Baqso", "Zizi", "Ioseb", "Maiko", "Karina"]

//REMOVE ELEMENTS
//POP - removes LAST ELEMENT FROM ARRAY
friends.pop(); //["Karina"]
//returns removed element
const popped = friends.pop();
console.log(popped); //["Karina"]
console.log(friends); //["Baqso", "Zizi", "Ioseb", "Maiko"]

//shift - Removes FIRST ELEMENT FROM THE ARRAY
friends.shift(); //["Baqso"]
console.log(friends); //["Zizi", "Ioseb", "Maiko"]

//indexOf - Tells the position of the element in the ARRAY
console.log(friends.indexOf("Zizi")); //0
//if we write the element which is not in the ARRAY we get : -1
console.log(friends.indexOf("zizi")); //-1, we need to write in CamelCase

//includes - modern method of indexOf
//includes - testing with STRICT EQUALITY
console.log(friends.includes("Zizi")); //true

array methods in javascript

ARRAY INSERTION

what are array methods in javascript

[1, 2, 3].push(4); // [1, 2, 3, 4]
[1, 2, 3].pop(); // [1, 2]
[1, 2, 3].shift(); // [2, 3]
[1, 2, 3].unshift(0); // [0, 1, 2, 3]
['a', 'b'].concat('c'); // ['a', 'b', 'c']
['a', 'b', 'c'].join('-'); // a-b-c
['a', 'b', 'c'].slice(1); // ['b', 'c']
['a', 'b', 'c'].indexOf('b'); // 1
['a', 'b', 'c'].includes('c'); // true
[3, 5, 6, 8].find((n) => n % 2 === 0); // 6
[2, 4, 3, 5].findIndex((n) => n % 2 !== 0); // 2
[3, 4, 8, 6].map((n) => n * 2); // [6, 8, 16, 12]
[1, 4, 7, 8].filter((n) => n % 2 === 0); // [4, 8]
[2, 4, 3, 7].reduce((acc, cur) => acc + cur); // 16
[2, 3, 4, 5].every((x) => x < 6); // true
[3, 5, 6, 8].some((n) => n > 6); // true
[1, 2, 3, 4].reverse(); // [4, 3, 2, 1]
[3, 5, 7, 8].at(-2); // 7
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javascript array functions

Array methods javascript

[1, 2, 3].push(4); // [1, 2, 3, 4]
[1, 2, 3].pop(); // [1, 2]
[1, 2, 3].shift(); // [2, 3]
[1, 2, 3].unshift(0); // [0, 1, 2, 3]
['a', 'b'].concat('c'); // ['a', 'b', 'c']
['a', 'b', 'c'].join('-'); // a-b-c
['a', 'b', 'c'].slice(1); // ['b', 'c']
['a', 'b', 'c'].indexOf('b'); // 1
['a', 'b', 'c'].includes('c'); // true
[3, 5, 6, 8].find((n) => n % 2 === 0); // 6
[2, 4, 3, 5].findIndex((n) => n % 2 !== 0); // 2
[3, 4, 8, 6].map((n) => n * 2); // [6, 8, 16, 12]
[1, 4, 7, 8].filter((n) => n % 2 === 0); // [4, 8]
[2, 4, 3, 7].reduce((acc, cur) => acc + cur); // 16
[2, 3, 4, 5].every((x) => x < 6); // true
[3, 5, 6, 8].some((n) => n > 6); // true
[1, 2, 3, 4].reverse(); // [4, 3, 2, 1]
[3, 5, 7, 8].at(-2); // 7