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Prakash nidhi Verma

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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