How to pass properties to a variable function in javascript?

Question

How to pass properties to a variable function? variable() works but when I try to pass a property i get "Uncaught TypeError: variable is not a function"

function firstFunc(a) {
  return `${a}`;
}

let variable = firstFunc();
document.write(variable(1));

I have no idea what you are trying to achieve here. newFunc is undefined. — Quentin
– Quentin, Commented Jul 7, 2016 at 17:50
These are not "properties", they are "parameters" or "arguments". There is no such thing as a "variable function", but a variable may hold a function. Also, can you please fix your post to use consistent names. — user663031
– user663031, Commented Jul 7, 2016 at 18:07

rpadovani · Accepted Answer · 2016-07-07 17:52:07Z

4

You wrote let variable = firstFunc(), so variable is the result of the execution of firstFunc().

You want instead that variable is a reference to the function (like an alias), so you need to do not put the brackets

function firstFunc(a) {
  return `${a}`;
}

let variable = firstFunc;
document.write(variable(1));

answered Jul 7, 2016 at 17:52

rpadovani

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TimoStaudinger · Accepted Answer · 2016-07-07 17:51:44Z

3

Two mistakes:

You confused firstFunc and newFunc
To assign a reference to the function to a variable, dont call it firstFunc(), just assign it without parenthesis ()

This works fine in browsers that support the ES6 features you are using:

function firstFunc(a) {
  return `${a}`;
}

let variable = firstFunc;
document.write(variable(1));

answered Jul 7, 2016 at 17:51

TimoStaudinger

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