Javascript How do i call functions from an array of function names

Question

var action = ['function1','function2' etc ]
var obj = new objectcreate ();

for (functionname in action){
    obj+'.'+action[variablename]+'()';      
}

the functions are already generated I just wanna go through an array and execute all the functions it on the object i created thanks for your help

for (functionname in action) doesn't do what you think; functionname will be properties of the Array, which may not be in numerical order and can return other properties depending on browser. Never use for...in on Array. Instead use the plain old C-style loop for(var i= 0; i<array.length; i++). — bobince
– bobince, Commented Jan 5, 2010 at 0:10

Li0liQ · Accepted Answer · 2010-01-04 23:23:21Z

3

obj[action[functionname]](); will do the trick.

answered Jan 4, 2010 at 23:23

Li0liQ

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2 Comments

K-Dawg Over a year ago

what if you didn't have an array of function names? Could this still be done?

Li0liQ Over a year ago

@PrimeByDesign I don't get you. If you have no function names available, the best you could do is enumerate all the fields of the objects and invoke those which are functions.

Daniel A. White · Accepted Answer · 2010-01-04 23:22:37Z

3

You should be able to do this.

obj[action[functionName]]();

answered Jan 4, 2010 at 23:22

Daniel A. White

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Comments

Patrick Lafferty · Accepted Answer · 2021-07-13 15:47:46Z

1

None of the answers above worked for me.

Noting that we are 10.5 years on from the original post the chances are JS have evolved.

My solution is:

window[action[functionName]]();

A solution tailored to the original question is as follows:

var action = ['test1','test2'];


function test1(){
   alert("test 1 running");
}

function test2(){
    alert("test 2 running");
}

for (var i=0; i<action.length; i++){
    window[action[i]]();
}

Expected output is an alert box saying "test 1 running" followed by another alert box saying "test 2 running".

answered Jul 13, 2021 at 15:47

Patrick Lafferty

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