How to use a string as a function in javascript or jquery?

Question

So I was trying to create a function that would put the value of i and j in a string as if it was a function. Lets say that we have a string = "i+j"

what i want is:

sum = sum + i + j

but currently what happens is

sum = sum + "i + j"

anyone got a solution for this?

In a string or get variables from string and add it to sum variable? — Yaroslav Yakovlev
– Yaroslav Yakovlev, Commented Aug 2, 2013 at 7:05
possible duplicate of Writing a function that "solves" an equation — Felix Kling
– Felix Kling, Commented Aug 2, 2013 at 7:05

Mihai Matei · Accepted Answer · 2013-08-02 07:07:16Z

2

var i = 5,
    j = 10,
    string = "i+j",
    sum = 100;

sum = sum + eval(string);

console.log(sum); // output 115

answered Aug 2, 2013 at 7:07

Mihai Matei

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Comments

Mukesh Dabhi · Accepted Answer · 2013-08-02 07:09:35Z

-1

use parseInt() :

sum = sum + parseInt(i) + parseInt(j)

answered Aug 2, 2013 at 7:09

Mukesh Dabhi

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Please read the question carefully. The OP has the string "i + j" and wants to evaluate it. parseInt does not help here.