I have a Function in which I want to retrieve the name of the variable that was used to call the function. How can I do that?
let fooVar = 3;
let barVar = "hello World";
function doStuff(variable) {
let varName = ???; // retrieve name of variable
return varName + ": " + variable;
}
document.write(doStuff(fooVar)); // should output "fooVar: 3"
document.write(doStuff(barVar)); // should output "barVar: hello World"
If variable was a Function, I could use variable.name.
I am aware of this, but it will only return "variable", not the name of the variable that was put into the function.
As an alternative: Is there a way to AUTOMATICALLY call a certain function whenever a variable is declared? If that was possible, I'd use the approach given in the link above to add the variable name to a map, then utilize that map inside the function to retrieve variable name.
That's actually impossible to do, as a workaround you can do something like this
let fooVar = { name: 'fooVar', value: 3 };
let barVar = { name: 'barVar', value: 'Hello World' };
function doStuff({ name, value }) {
let varName = name; // retrieve name of variable
return varName + ": " + value;
}
console.log(doStuff(fooVar)); // should output "fooVar: 3"
console.log(doStuff(barVar));or you can do
let fooVar = 3;
let barVar = 'Hello World';
function doStuff(variable) {
const arr = Object.entries(variable)[0];
const [name, value] = arr;
let varName = name; // retrieve name of variable
return varName + ": " + value;
}
console.log(doStuff({ fooVar })); // should output "fooVar: 3"
console.log(doStuff({ barVar }));