JS access existing variable through string

Question

I am searching through existing data in Js through a variable, I found that maybe I can access the data through window["variable_name"] , but Js can't find the variable.

How am I going to access the data, or is there a better way to store the data and access it.

The data format

let info1=[{"id":0, "label":"XXX"},{"id":1, "label":"XXX"}, ...];
let info2=[{"id":0, "label":"XXX"},{"id":1, "label":"XXX"}, ...];
.
.
.
let info2000=[{"id":0, "label":"XXX"},{"id":1, "label":"XXX"}, ...];

Trying to access the variable

for (let i=1; i<=2000; i++) {
    console.log(window["info"+i]);
}

Are the variables being sought in global scope? Can you change their declaration to use var instead of let? In short, what constraints does a solution need to meet? I answered a similar question here but is has limitations: - using eval is never attractive and may be disabled in some run time environments. — traktor
– traktor, Commented Feb 12, 2023 at 8:57

Joshua Ooi · Accepted Answer · 2023-02-12 06:04:29Z

2

You cant access the variable with window because you declared the variable with let. You need to use var to declare.

Variables declared by let are only available inside the block where they're defined. Variables declared by var are available throughout the function in which they're declared.

var info1=[{"id":0, "label":"XXX"},{"id":1, "label":"XXX"}];
var info2=[{"id":0, "label":"XXX"},{"id":1, "label":"XXX"}];

console.log(window["info1"]);
console.log(window["info2"]);

answered Feb 12, 2023 at 6:04

Joshua Ooi

1,1907 silver badges20 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

JS access existing variable through string

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related