How to use parseFloat to convert string to a number?

Question

I was wondering how to use parseFloat with a string?. Example:

var N = 3.43;
var M = 43.37;
var subtotal = N + M;
subtotal=parseFloat("subtotal");

You don't have any string... :-? – Álvaro González Jul 01 '15 at 15:14 — Álvaro González, Jul 01 '15 at 15:14

Tushar · Answer 1 · 2015-07-01T14:40:22.417

2

You don't need parseFloat in your case.

To use parseFloat on a variable:

subtotal = parseFloat(subtotal); // No quotes here

Example:

var value = "3.14"; // String
var PI = parseFloat(value); // Float

OR

var PI = Number(value); // Float

OR

var PI = +value; // Float

edited Jul 01 '15 at 14:40

answered Jul 01 '15 at 14:20

Tushar

For your example, I would not use `parseFloat`, but rather `Number` or even `+` : ```var value = "3.14"; var valueAsNumber = Number(value); var valueAsNumber2 = +value; ``` Since `parseFloat` is much less performant. I would keep it to parse "33.333%", though – laruiss Jul 01 '15 at 14:35
@laruiss Thanks! Updated answer – Tushar Jul 01 '15 at 14:39

score 1 · Answer 2 · answered Jul 01 '15 at 14:34

1

Remove the quotes that you are passing inside parsefloat.

var N = 3.43;
var M = 43.37;
var subtotal = N + M;
subtotal=parseFloat(subtotal);

answered Jul 01 '15 at 14:34

sTg

2 Answers2