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Javascript setTimout question

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I am following the excellent book Foundation Game Design with HTML5 and Javascript.

I have a piece of code, which works but i'm not sure why.

function destroyAlien(alien)
//Change the alien's state and update the object
alien.state = alien.EXPLODED;


//Remove the alien after 1 second
setTimeout(removeAlien, 1000);

function removeAlien()
removeObject(alien, aliens);
removeObject(alien, sprites);

As you can see it is a function which uses setTimout to call another function. It only calls removeAlien function when it is inside the main function. If I move callAlien function out of the main function it does not work. I am puzzled as to why this is.

Can any sage member here tell me why this is?
Thanks in advance
Posts: 2
Joined: 12 Nov 2020, 16:02

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Now I understand b10b 

Thank you for the reply and explanation with link.Most kind.

Very early in the book there was indeed a paragraph on scope which I had forgotten. I ran a search for scope through the pdf and found it.

Thanks again.

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