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There are several methods, all leading to a similar place.

The first is to simply declare a function using the function keyword:

function ourFunction(args){}

The second is to assign a variable as a function:

var ourFunction = function(args) {};

And the third (commonly used in JavaScript frameworks, or when function is being passed as a parameter) is to just use an anonymous function.

window.onload = function(args) {};

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