JavaScript array function

Anonymous User 1244 16 Jul 2018

How to use of JavaScript Array Functions ?

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1 Answers

Prakash nidhi Verma 16 Jul 2018

use JavaScript Array Functions :

1. prototype.reduce(): A callback function

syntax :

arr.reduce(callback[, initialValue])

ex.

function reduceFun1(previousValue, currentValue, index, array){ 
    return previousValue + currentValue;

}

var result = [1,2,3,4,5].reduce(reduceFun1);

console.log(result);

2. prototype.concat():

syntax :

NewArray = Array1.concat(value1[, value2[, ...[, valueN]]])

ex.

var arr1 = [1,2,3,4];

var arr2 = [5,6,7,8];

var arr3 = arr1.concat(arr2);

console.log(arr3);

3.prototype.sort():

syntax:

arr.sort([compareFunction])

ex.

var arr = [3, 1, 5, 4, 2].sort(); 
console.log(arr);

prototype.reverse():

syntax:

array.reverse()

ex.

var arr = [1,2,3,4,5,6,7,8,9,10];

arr.reverse();

console.log(arr);

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JavaScript array function

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