How does array function work?

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Ariful Islam Adil(Code Lover) answered on March 30, 2021 Popularity 10/10 Helpfulness 1/10

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How does array function work?

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1

const printResult = (a, b) => {
    return a + b;
}
console.log(printResult(5, 8));
//Expected output: 13

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Tags: function javascript

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Ariful Islam Adil(Code Lover)

Contributed on Sep 04 2021

Ariful Islam Adil(Code Lover)

0 Answers Avg Quality 2/10

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javascript array functions

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72

concat(arr1,[...]) // Joins two or more arrays, and returns a copy of the joined arrays
copyWithin(target,[start],[end]) // Copies array elements within the array, to and from specified positions
entries() // Returns a key/value pair Array Iteration Object
every(function(currentval,[index],[arr]),[thisVal]) // Checks if every element in an array pass a test
fill(val,[start],[end]) // Fill the elements in an array with a static value
filter(function(currentval,[index],[arr]),[thisVal]) //	Creates a new array with every element in an array that pass a test
find(function(currentval,[index],[arr]),[thisVal]) // Returns the value of the first element in an array that pass a test
findIndex(function(currentval,[index],[arr]),[thisVal]) // Returns the index of the first element in an array that pass a test
forEach(function(currentval,[index],[arr]),[thisVal]) // Calls a function for each array element
from(obj,[mapFunc],[thisVal]) // Creates an array from an object
includes(element,[start]) // Check if an array contains the specified element
indexOf(element,[start]) // Search the array for an element and returns its position
isArray(obj) // Checks whether an object is an array
join([seperator]) // Joins all elements of an array into a string
keys() // Returns a Array Iteration Object, containing the keys of the original array
lastIndexOf(element,[start]) // Search the array for an element, starting at the end, and returns its position
map(function(currentval,[index],[arr]),[thisVal]) // Creates a new array with the result of calling a function for each array element
pop() // Removes the last element of an array, and returns that element
push(item1,[...]) // Adds new elements to the end of an array, and returns the new length
reduce(function(total,currentval,[index],[arr]),[initVal]) // Reduce the values of an array to a single value (going left-to-right)
reduceRight(function(total,currentval,[index],[arr]),[initVal]) // Reduce the values of an array to a single value (going right-to-left)
reverse() // Reverses the order of the elements in an array
shift() // Removes the first element of an array, and returns that element
slice([start],[end]) // Selects a part of an array, and returns the new array
some(function(currentval,[index],[arr]),[thisVal]) // Checks if any of the elements in an array pass a test
sort([compareFunc]) // Sorts the elements of an array
splice(index,[quantity],[item1,...]) // Adds/Removes elements from an array
toString() // Converts an array to a string, and returns the result
unshift(item1,...) // Adds new elements to the beginning of an array, and returns the new length
valueOf() // Returns the primitive value of an array

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Neemesh

Contributed on Mar 30 2021

Neemesh

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array function in javascript

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1

Array:
.length - Property that represents the number of elements in an array.
.concat() - Joins two or more arrays and returns a new array.
.indexOf() - Returns the index of the first occurrence of a specified element.
.lastIndexOf() - Returns the index of the last occurrence of a specified element.
.push() - Adds one or more elements to the end of an array.
.pop() - Removes the last element from an array.
.shift() - Removes the first element from an array.
.unshift() - Adds one or more elements to the beginning of an array.
.slice() - Extracts a portion of an array into a new array.
.splice() - Changes the contents of an array by removing or replacing existing elements.
.forEach() - Calls a function for each element in an array.
.map() - Creates a new array with the results of calling a provided function on every element.
.filter() - Creates a new array with elements that pass a test.
.reduce() - Applies a function against an accumulator and each element in the array (from left to right) to reduce it to a single value.

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Sleepy Head

Contributed on Oct 03 2023

Sleepy Head

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array function in javascript

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2

[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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Happy Hawk

Contributed on Mar 22 2023

Happy Hawk

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An Array Of Functions

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0

	const fns = [()=>{console.log("first")}, ()=>{console.log("second")}, function(){console.log("third")}]

fns[0]();
/*remember the (), the function will not execute with only fns[0]*/

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Javasper

Contributed on Jun 20 2022

Javasper

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