How to call Array name with a string in JS

Question

const EleList = [1,2,3]
name = 'Ele'

const render = function(type){
    window[type + 'List'].forEach(function(value){
    console.log("LOL")


render('Ele')

What am i supposed to replace the window[name + 'List'] with to call an array using strings.

I don't know if we'll be able to answer that without knowing what the context is in which this code exists. That said, dynamic variable names are often a bit of a smell... I'd be curious as to your end-goal here. — Tyler Roper
– Tyler Roper, Commented Oct 16, 2019 at 14:26
var arr = window[name + 'List']; arr.forEach((value)=> { ... }) — GrafiCode
– GrafiCode, Commented Oct 16, 2019 at 14:27
But, why would you want to pollute the global object? I would suggest you to simply use an object if you can. — Christian C. Salvadó
– Christian C. Salvadó, Commented Oct 16, 2019 at 14:29
Something along the lines of this example would be better IMHO than using var. — Christian C. Salvadó
– Christian C. Salvadó, Commented Oct 16, 2019 at 14:36

XCS · Accepted Answer · 2019-10-16 14:28:47Z

1

const or let variables are not added to the global window object.

Replacing const with var should solve your problem.

var EleList = [1,2,3]

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const

Global constants do not become properties of the window object, unlike var variables.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let

Just like const the let does not create properties of the window object when declared globally (in the top-most scope).

edited Oct 16, 2019 at 14:28

answered Oct 16, 2019 at 14:26

XCS

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1 Comment

XCS Over a year ago

@Rubaninferno You are welcome. It is a bit of a weird spec decision that var adds the variable to the window, but const or let do not. If the answer solved your issue you can mark it as accepted by clicking the checkmark icon.

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