Accessing variable value by string name

Asked Sep 12 '19 at 08:32

Active Sep 12 '19 at 09:29

Viewed 326 times

Issue: I want to access some variables I got in my js-file by a string.

I know there is an option to receive variable value if you have an object and pass the object key name in square brackets to the object, but this is not the case here. Here I have just one comon variable, and I want its value by "sending" a string down.

Example on what I want to achieve:

const constantName = 12345; // Value to access
const stringToUseToGetTheValueOfConstantName = 'constantName';

// I want to know how to get the '12345' by something like this:
const valueFinallyAccessed = `${stringToUseToGetTheValueOfConstantName}`; // I know this returns a string
console.log(valueFinallyAccessed); // 12345

Solution

const valueFinallyAccessed = eval(stringToUseToGetTheValueOfConstantName);
console.log(valueFinallyAccessed); // Prints out the value 12345

edited Sep 12 '19 at 09:29

asked Sep 12 '19 at 08:32

RMT

Also see: https://stackoverflow.com/questions/5117127/use-dynamic-variable-names-in-javascript – Harun Yilmaz Sep 12 '19 at 08:36
@HarunYilmaz - works with `var` not with `const` or `let` - unless `eval` is the answer – Jaromanda X Sep 12 '19 at 08:37
I didn't try it. I just wanted to share a similar question. – Harun Yilmaz Sep 12 '19 at 08:38
1

I added to the comment - `eval` :p – Jaromanda X Sep 12 '19 at 08:39
@JaromandaX thank you so much, the eval suggestion did work perfectly! I will update my question with the solution – RMT Sep 12 '19 at 09:27

Accessing variable value by string name

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