Convert string into variable in array automatically

Question

I have a problem when Im trying to convert a string to a variable in an array.

The variables are:

const n = 1; const s = -1;

The array string:

let walk = ['n', 's', 'n', 's', 'n', 's', 'n', 's', 'n', 'n'];

I want to convert automatically to this variable array:

let walk = [n, s, n, s, n, s, n, s, n, n];

I'm trying to split but the array still string not a var:

let text = walks.toString().split(',').join('-')
console.log(text)

Does this help? ["Variable" variables in JavaScript](https://stackoverflow.com/questions/5187530/variable-variables-in-javascript) — evolutionxbox, Dec 23 '21 at 02:47

score 3 · Accepted Answer · answered Dec 23 '21 at 02:49

You could put s and n into an object.

const variables = {
  n: 1,
  s: -1
};

let walk = ['n', 's', 'n', 's', 'n', 's', 'n', 's', 'n', 'n'];

console.log(
  walk.map(variable => variables[variable])
)

See this question for more info on accessing variables via another variable.

score 0 · Answer 2 · answered Dec 23 '21 at 02:44

0

You could use eval, but it is usually not recommended.

const n = 1; const s = -1;
let walk = ['n', 's', 'n', 's', 'n', 's', 'n', 's', 'n', 'n'].map(eval);
console.log(walk);

answered Dec 23 '21 at 02:44

Unmitigated

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score 0 · Answer 3 · answered Dec 23 '21 at 03:12

As @Unimitigated said, eval() is not recommended to use.

For more details refer to this link Never use eval()!

For a better way, without eval(). You can try this approach

const n = 1; const s = -1;
const array = [];
let walk = ['n', 's', 'n', 's', 'n', 's', 'n', 's', 'n', 'n'].map(value => {
  return Function('"use strict";return (' + value + ')')();
});

I hope this would be useful.

Convert string into variable in array automatically

3 Answers3