JavaScript how to creating dynamic variable

Question

I am trying to create dynamic variable, for example rather saying

let f0, f1 = '';

and then using these variable in forEach

{Object.keys(shop).forEach((element, key) => {
              if (element == dName[0]) {
                f0 = Object.values(shop)[key];
              }           
              if (element == dName[1]) {
                f1 = Object.values(shop)[key];
              }
            })}

trying below,

let k = 'f'; 
    let i = 0; 
    for(i = 1; i < 2; i++) { 
        eval('let ' + k + i + '= \'\' ;'); 
    } 
    console.log("f1=" + f1);

but console printing

f1=undefined

what wrong I am doing, thanks in advance

Why would you do this? It negatively affects security, performance, readability, maintainability, and you don't need it. If you want dynamic identifiers, use an object with computed property names — Aluan Haddad
– Aluan Haddad, Commented Aug 15, 2020 at 19:46

Damien · Accepted Answer · 2020-08-15 19:47:36Z

4

i don't know if it is possible with eval but you could use an object to store your variables like this

let k = 'f'
let vars = {}

for(i = 1; i < 5; i++) { 
  vars[k+i] = '' 
} 
console.log(vars)
console.log("f1=" + vars.f1);

answered Aug 15, 2020 at 19:47

Damien

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