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Is there anyway to convert a string to a condition inside if statement:

example:

var condition = "a == b && ( a > 5 || b > 5)";

if(condition) {
    alert("succes");
}

A safer alternative to eval() may be Function().

var condition = "4 == 4 && ( 10 > 5 || 9 > 5)";
var evaluate = (c) => Function(`return ${c}`)();

if(evaluate(condition)) {
    alert("succes");
}

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eval can help, but try to avoid using it

let a = 6;
let b = 6
var condition = "a == b && ( a > 5 || b > 5)";

if (eval(condition)) {
  alert("succes");
}

Dynamic if statement evaluation/generation, It might be possible using the .NET framework built in code compiler. I have never done this myself, but i have seen demos of it done with� Definition and Usage. The if/else statement executes a block of code if a specified condition is true. If the condition is false, another block of code can be executed. The if/else statement is a part of JavaScript's "Conditional" Statements, which are used to perform different actions based on different conditions.

use eval :

var condition = "4 == 4 && ( 10 > 5 || 9 > 5)";

if(eval(condition)) {
    alert("succes");
}

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You can use new function

let a = 6;
let b = 6
var condition = "a == b && ( a > 5 || b > 5)";

let func = new Function('a','b', `return (${condition})` )

if(func(a,b)) {
    alert("succes");
}

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Convert your data and condition to JSON

Then set the condition by hand:

var json = '{"a":20, "b":20, "max":5}'; //Max is your condition
var data = JSON.parse(json);
var a = data.a;
var b = data.b;
var max = data.max;

if(a == b && ( a > 5 || b > 5)) {
    console.log("foobar");
}

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Comments
  • eval or new Function, but that is a bad idea....
  • You can technically, but that is not a good practice - Can you add a bit of context to your question? Why do you need that ?
  • Possible duplicate of Why is using the JavaScript eval function a bad idea?
  • 24ways.org/2005/dont-be-eval
  • Does Function used this way alleviate any of eval()'s issues?
  • Agreed, no use eval if possible.
  • @MichaelLeVan stackoverflow.com/questions/86513/…
  • @MichaelLeVan MDN: Do not ever use eval()!
  • There's a reason eval is shunned.