CODEWITHSUNDEEP
javascriptjquery
babusi
babusi

Reputation: 520

JS Multiply last children in an array

I'm trying to multiply the last children of an array by a variable number for use in a chart but I can't get the multiplier to work.

Here's my code:

var data = [12, 19, 3, 5, 2, 3,12,43,60,78,98,130];
data.slice(-6, 13)*1.2;

JSFiddle

Upvotes: 0

Views: 107

Answers (3)

Pankaj Shukla
Pankaj Shukla

Reputation: 2672

Do it like:

var test = (data.slice(-6, 13).map(x =>x*1.2));

Upvotes: 3

Jurij Jazdanov
Jurij Jazdanov

Reputation: 1268

data.slice(-6, 13) - gives you an array, you can't multiply an array. You need to loop through values and multiply them.

var data = [12, 19, 3, 5, 2, 3,12,43,60,78,98,130];
var dataToMultiply = data.slice(-6, 13);
var multipliedData = [];

dataToMultiply.forEach(function(element) {
    multipliedData.push(element * 1.2);
});

console.log(multipliedData);

Upvotes: 3

boehm_s
boehm_s

Reputation: 5564

if you want to get the following values multiplied by 1.2,

[12, 43, 60, 78, 98, 130]

You can use the Array#map method : 

var data = [12, 19, 3, 5, 2, 3,12,43,60,78,98,130];
data.slice(-6, 13).map(function(el) { return el * 1.2;})

// => [14.399999999999999, 51.6, 72, 93.6, 117.6, 156]

and if you want to keep them in the array, you can do the following : 

var data = [12, 19, 3, 5, 2, 3,12,43,60,78,98,130];
data.map(function(el, i) { return i >= 6 ? el * 1.2 : el});

Hope it helps,

Best regards

Upvotes: 3

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