how to call a function stored in an array

Question

I have this simple example that works

const func1 = function (i) { return (i) }
const func2 = function (i) { return (i * 2) }
const func3 = function (i) { return (i * 3) }
const func4 = function (i) { return (i * 4) }
const funcs = ['func1', 'func2', 'func3', 'func4']

function myFunction() {

  let item = 3
  let i = 2
  let result = eval(`${funcs[item]}(${i})`)
  console.log(result)
  // what about call_user_func in google app script

}

Since eval() is not recommended, what will be the google app script equivalent of call_user_func (php)?

ethandjay · Accepted Answer · 2022-06-09 14:33:25Z

1

I'm unfamiliar with Google Apps Script but in standard JS you should just be able to call it like let result = funcs[item](i);

For this you also need to put your actual function variables into the array, like const funcs = [func1, func2, func3, func4], not like const funcs = ['func1', 'func2', 'func3', 'func4']

Functions are first-class citizens in JS, which means you can pass them around and call them like any other variable

edited Jun 9, 2022 at 14:33

answered Jun 9, 2022 at 14:25

ethandjay

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2 Comments

Mike Steelson Over a year ago

I have tried so many ways! Thanks a lot.

ethandjay Over a year ago

Accept the answer if you like it :) JavaScript is a weird beast but pretty cool when you get the right mindset for it

Cooper · Accepted Answer · 2022-06-09 19:00:09Z

1

In google apps script you can also call functions by name

function executeFunctionByName(func) {
  this[func]();
}

answered Jun 9, 2022 at 19:00

Cooper

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4 Comments

Mike Steelson Over a year ago

Thx Cooper ... Something weird: it's ok if I write the function as follows function myFunc(x) { Browser.msgBox(x * 2); }, and it doesn't work if function is written as const myFunc = function (x) { Browser.msgBox(x * 2) }! Do you have an explanation?

Cooper Over a year ago

What does that have to do with my answer?

Mike Steelson Over a year ago

I tried your suggestion. Unfortunately, I couldn't achieve the expected result with my definition of the functions (see the posted request) until I changed them. That's all! But I also remember this one. Upvoted.

Cooper Over a year ago

I run all kinds of functions this way all of the time. I search for them in my new development files and load them into a drop down in my side bar thus allowing me to easily run new functions from the sidebar.

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In google apps script you can also call functions by name

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In google apps script you can also call functions by name

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