Split string in javascript into an array

Question

I am using the eval() function to create an calculator, and as you know eval returns a string (I am referring to this tutorial), for example 20+30. What I want now is to split this string so I will have an array of data like [20,30,50] where the 20 and 30 are the operands and 50 is the result in this case.

What I did so far is:

var input = document.getElementById('screen');
var result= '20+30'; // as an example
var firstOperand = result.split('+', 1); //this is taking the first operand

What I really want is as I mentioned to turn my input value that is string "20+30" to an array: myArr = [20,30,50].

Any help?

Community · Accepted Answer · 2017-05-23 11:58:19Z

1

Use the power of maps and reduce!

result = '1+2+3+4+5+6+7+8+9';
a = result.split('+').map(function(x){ return parseInt(x) });
b = a;
b.push(a.reduce(function(p, c) { return p+c; }));
// b = [1, 2, 3, 4, 5, 6, 7, 8, 9, 45]

Btw you shouldn't use eval(), look into the Shunting-yard algorithm instead. Code examples for the algorithm can be found here at SO and at Rosettacode.

edited May 23, 2017 at 11:58

CommunityBot

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answered Mar 25, 2015 at 21:41

Sawny

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Comments

kiks73 · Accepted Answer · 2015-03-25 21:25:36Z

0

you can create the array passing to the split function only the separator.

var myArr = result.split('+');

now you need to add the result:

myArr.push("50");

answered Mar 25, 2015 at 21:25

kiks73

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