Compile if condition from String Variable in javascript

Question

I have a variable

var condition = "if(2 > 5)";

And sometime it will be

var condition = "if(3>5 && 4<2){quantity = 45;} else quantity=60;";

How I can compile these conditions, as these are in string variable?

you need to seperate them in array and then work accordingly for each conditions — Ashish sah
– Ashish sah, Commented Aug 23, 2017 at 16:18
i pass the complete condition to eval function which is If (22.13> 72) QTY=3; else QTY=2; but it gives me an error "Unexpected identifier" — Kamran Khan Baloch
– Kamran Khan Baloch, Commented Aug 23, 2017 at 17:45

Daniel · Accepted Answer · 2017-08-23 16:18:58Z

1

It's dangerous to use because it can allow most anything to be injected into your code, but eval is the right thing to use here, if you really do have to have string evaluated to code.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval

eval(condition)

answered Aug 23, 2017 at 16:18

Daniel

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3 Comments

Kamran Khan Baloch Over a year ago

how i can pass the complete condition like If (22.13> 72) QTY=3; else QTY=2

Kamran Khan Baloch Over a year ago

Thanks a lot, its compiled,

Kamran Khan Baloch Over a year ago

eval("if(2>4){ a=4} else {a=5}")

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