How to make string to object or array format [duplicate]

Question

I have to create a string in format like below

  "currentState[0]['children'][1]"

But I need to execute it later just like below

  currentState[0]['children'][1]

I have elements and childrens on currentState. But while looping I have to create a string. But later I need to execute as array.

I have tried almost all array methods. Array.call, bind etc. And string methods as well. Could not get the output

How can I make it

The posted question does not appear to include any attempt at all to solve the problem. StackOverflow expects you to try to solve your own problem first, as your attempts help us to better understand what you want. Please edit the question to show what you've tried, so as to illustrate a specific problem you're having in a minimal reproducible example. For more information, please see How to Ask and take the tour. — CertainPerformance
– CertainPerformance, Commented Sep 19, 2018 at 4:49
Use eval: $str = "currentState[0]['children'][1]". Then: $test = eval($str); — protoproto
– protoproto, Commented Sep 19, 2018 at 4:54
You can use eval function. Eval will evaluate complete string — Sourabh Somani
– Sourabh Somani, Commented Sep 19, 2018 at 4:55
Yes eval will get the job done, but; eval is frowned upon because it can be used for a wide variaty of attacks on your code, your application, your user, ... — Thomas
– Thomas, Commented Sep 19, 2018 at 5:10

Ricardo Jansen · Accepted Answer · 2018-09-19 05:35:00Z

0

Please be more specific with your question but from my understanding, you can use javascript's eval() function to execute a string as javascript, so when you need to execute it, just run eval("currentState[0]['children'][1]").

The alternative to the eval() would be

function evalFn(obj) { return Function('"use strict";return (' + obj + ')')(); }

evalFn("currentState[0]['children'][1]")

refer to: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval for a more in-depth explanation.

edited Sep 19, 2018 at 5:35

answered Sep 19, 2018 at 4:54

Ricardo Jansen

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1 Comment

Adrian Brand Over a year ago

Absolutely never do this. eval is a major security risk.

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