CODEWITHSUNDEEP
javascriptarraysforeachcallback
Simoroshka
Simoroshka

Reputation: 349

calling internal method for each object in an array

I have a "class" with properties and methods. And I have instances of that class in an array in some other place in the code. Now I want to iterate through all of them and for each call a method. Something like this:

arr.forEach(draw());

But of course it looks up a global function draw() which is not there. How do I access object's methods in this situation?

I am new to javascript, so I assume it might be a stupid question, but I can't find an answer for some reason.

Upvotes: 0

Views: 148

Answers (2)

jeronimo vallelunga
jeronimo vallelunga

Reputation: 204

here is the documentation of the forEach function https://msdn.microsoft.com/library/ff679980(v=vs.94).aspx

forEach first parameter is an callback function... that function receives 3 parameters, the first one is each object in that array.

arr.forEach(function(element){
  draw()
});

Where element is the object you want to access.

Upvotes: 1

tvanfosson
tvanfosson

Reputation: 532595

forEach takes a callback that accepts 3 arguments, the array element, the index, and the array. You only need the first. Wrap your call to draw() in an anonymous function and invoke it on the element from the function call.

arr.forEach(function(elem) { elem.draw(); });

Upvotes: 2

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