Find and call javascript functions in global scope - Stack Overflow

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I have registered some javascript functions in the global scope:

function Test1() {}
function Test2() {}

Now I want to run all javascript functions whose name starts with 'Test', how to do it?

I want to prevent saving each functions into a variable because it does not scale. Nor to push them to a queue and execute them later, since people need to remember adding their functions to the queue when they write the test and I don't want that.

I have registered some javascript functions in the global scope:

function Test1() {}
function Test2() {}

Now I want to run all javascript functions whose name starts with 'Test', how to do it?

I want to prevent saving each functions into a variable because it does not scale. Nor to push them to a queue and execute them later, since people need to remember adding their functions to the queue when they write the test and I don't want that.

• javascript

Share Improve this question Follow asked Sep 24, 2018 at 22:43 yijiemyijiem 36933 silver badges1818 bronze badges 7

• are the functions named "Test" + number or "Test" + anything else ? – Stakvino Commented Sep 24, 2018 at 22:49
• 1 Iterate over all properties of window and check whether it starts with Test? But since there are lots of things in global scope, maintaining your own list is probably better. Naming variables/functions with consecutive numbers is a string sign that you should be using an array instead. "I want to prevent saving each functions into a variable because it does not scale." Can you elaborate what you mean? – Felix Kling Commented Sep 24, 2018 at 22:50
• I want to prevent saving each functions into a variable because it does not scale. Can you elaborate on this, because it doesn't sound right. – Matt Way Commented Sep 24, 2018 at 22:53
• If you don't provide more/other information then this is a duplicate of Calling multiple functions with names matching Regex – Felix Kling Commented Sep 24, 2018 at 22:53
• Also related: “Variable” variables in Javascript? – Felix Kling Commented Sep 24, 2018 at 22:58

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3 Answers 3

Sorted by: Reset to default 6

var globalKeys = Object.keys(window);

for(var i = 0; i < globalKeys.length; i++){
  var globalKey = globalKeys[i];
  if(globalKey.includes("Test") && typeof window[globalKey] == "function"){
    window[globalKey]();
  }
}

function Test() { console.log('test') }
Object.keys(window).filter(s => s.startsWith('Test')) // [ "Test" ]

As you can see, functions are defined on the global scope.

const isTest = s => typeof s === 'function' && s.startsWith('Test')
Object.keys(window).filter(isTest).map(t => t())

I don't know your use case entirely, but I suspect it would be better to provide your own object.

const tests = {}
tests.Test1 = () => {/*...*/}

You could get all elements of window and check them. Here is a basic starting point :

for(let objectName in window){ console.log(`${objectName} : ${typeof window[objectName]}`) }

Now objectName is actually a string, it could be anything, just check if it starts with Test, and if its type is a function.

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