d3.js - Convert Javascript object to array of numbers -

i have object has set of numbers

> var size = d3.values(data[0]);  >size output: ["0", "14.71", "50.0", "35.29"]  >typeof(size); output: "object" 

i want sum width , output below:

[0, 14.71, 64.71, 100]

but output got below:

>var width = [size[0],                     size[0]+size[1],                     size[0]+size[1]+size[2],                     size[0]+size[1]+size[2]+size[3]];  >width output: ["0", "014.71", "014.7150.0", "014.7150.035.29"] 

please me fix this. in advance...

you use array#map , thisargs , implicit casting number element.

var data = ["0", "14.71", "50.0", "35.29"],      width = data.map(function (a) {          return this.count += +a;      }, { count: 0});    console.log(width);

es6 without use of thisarg (this not work arrow function), closure of count.

var data = ["0", "14.71", "50.0", "35.29"],      width = data.map((count => => count += +a)(0));    console.log(width);