Removing double quotes from a string with javascript

Question

I've got a string that I make dynamically. At the end I've got this:

fullcondition: "5439=5436 or 5439=5438"

The variable fullcondition contains "5439=5436 or 5439=5438" with these double quotes.

fullcondition is used after in an if statement and that's why I need to remove double quotes.

if ("5439=5436 or 5439=5438")

does not work What I need is:

if (5439=5436 or 5439=5438).

Thanks in advance.

Additionally, I feel like you might be under the impression that you will now be able to write `if (fullcondition)` and expect to evaluate the string contents as the condition. Which is not the case. Just so you know. — Luke Joshua Park, Oct 02 '15 at 12:00
Even without quotes that's not a valid conditional expression. SHow where this string is created — charlietfl, Oct 02 '15 at 12:01
Also in JS, comparison is using == or === and not = which is assignment — mplungjan, Oct 02 '15 at 12:03
@LukePark: You'd have to use `.replace(/"/g, "")` to replace more than just the first one. Not that I think there are actually any quotes in the OP's string in the first place. :-) — T.J. Crowder, Oct 02 '15 at 12:07
@T.J.Crowder I always forget about that in JS. You are correct. — Luke Joshua Park, Oct 02 '15 at 12:09

score 0 · Answer 1 · edited May 23 '17 at 12:22

You can write something like:

var x = "5439=5436 or 5439=5438".replace(/=/g, '===').split(' or ');

if ( eval(x[0]) || eval(x[1]) ) {
    // some code
}

but using eval can be dangerous :)

EDIT: without eval:

var x = "5439=5436 or 5439=5438".split(' or ');
var left = x[0].split('=');
var right = x[1].split('=');

if (left[0]===left[1] || right[0]===right[1]) {
    // some code 
}

or shorten:

var x = "5439=5436 or 5439=5438".replace(' or ', '=').split('=');

if (x[0]===x[1] || x[2]===x[3]) {
    // some code
}

score -1 · Answer 2 · answered Oct 02 '15 at 12:03

-1

You can use the eval to evaluate a string:

eval("5439==5436 || 5439==5438")

But this assumes you have done some regex to convert your expression to something javascript can interpret.

answered Oct 02 '15 at 12:03

ergonaut

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Removing double quotes from a string with javascript

2 Answers2