Function to get sum of array of numbers

Question

Javascript

I'm getting 00.10.10.20.20.050.050.05 as my output. However, I want the sum which should be .75

var array = ['0.1','0.1','0.2','0.2','0.05','0.05','0.05']
var sum = 0;
function sumArray() {
    var random = Math.floor(Math.random() * 100);
    for (i=0; i < array.length ; i++) {
      sum +=array[i];
    }

}
sumArray();
alert(sum);

A string is not a number...

Andreas
– Andreas

2018-10-30 19:53:43 +00:00
Commented Oct 30, 2018 at 19:53 — Andreas
– Andreas, Commented Oct 30, 2018 at 19:53

Ariel · Accepted Answer · 2018-10-30 19:59:13Z

2

Actually you are concatenating strings (your array has strings on it). Just parse your strings:

var array = ['0.1','0.1','0.2','0.2','0.05','0.05','0.05']
var sum = 0;
function sumArray() {
    var random = Math.floor(Math.random() * 100);
    for (i=0; i < array.length ; i++) {
      sum += parseFloat(array[i]);
    }

}
sumArray();
alert(sum);

answered Oct 30, 2018 at 19:59

Ariel

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Comments

manonthemat · Accepted Answer · 2018-10-30 20:28:35Z

-1

let array = ['0.1','0.1','0.2','0.2','0.05','0.05','0.05'];
let sum = array.reduce((a, b) => parseFloat(a) + parseFloat(b));
console.log(sum);

edited Oct 30, 2018 at 20:28

answered Oct 30, 2018 at 19:56

manonthemat

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2 Comments

Andreas Over a year ago

While this code may answer the question, providing additional context regarding how and/or why it solves the problem would improve the answer's long-term value.

Mark Over a year ago

You're not using the same array as the question.

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