获取输入变量的名称（如 Function.name）

Question

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.

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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.

Answer 1

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 }));