Question 175517 in Javascript Question posted in
A very good W3school tutorial can be found here.

Can JavaScript access loop variables’ original names?

In the following example code, the function "getOriginalName" does not exist, but that is what I am looking for:

for(let variable of [var1, var2, var3]) {
    console.log("Value: " + variable);
    console.log("Name: " + getOriginalName(variable));
}

In my dreams, getOriginalName would return "var1", "var2" and "var3".

I know that you can access the name of variable "x" with:

varName = Object.keys({x})[0]

However, in my case this does not get me far, as the loop variable is called "variable" in each iteration.
So is there no way to iterate over a list of variables and still get the name of these variables?

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2

Answers


  1. 0

    Unfortunately, there is no built-in way to achieve this in JavaScript, as variable names are not accessible during runtime. However, you can work around this limitation by using an array of objects, where each object contains the variable name as a key and its value as the corresponding value. Here’s an example:

    const var1 = 'apple';
const var2 = 'banana';
const var3 = 'cherry';

const variables = [
  {name: 'var1', value: var1},
  {name: 'var2', value: var2},
  {name: 'var3', value: var3}
];

for (let obj of variables) {
  console.log('Value: ' + obj.value);
  console.log('Name: ' + obj.name);
}

    This code will produce the following output:

    Value: apple
Name: var1
Value: banana
Name: var2
Value: cherry
Name: var3

    This workaround allows you to keep track of both the variable names and their values during iteration. Note that this approach requires you to manually create and maintain the variables array, which may not be ideal for all use cases.

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  2. 0

    Based on your comment, you can use an object containing key value pairs:

    let var1 = 1;
let var2 = 2;
let var3 = 3;

Object.entries({
  var1,
  var2,
  var3
}).forEach(([k, v]) => {
  console.log("Name: " + k);
  console.log("Value: " + v);
});
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