JavaScript Interview Episode 1 - Difference between a Function Declaration and Function Expression

There are three ways a JavaScript function can be created. They are as follows:

1. Function declaration
2. Function expression
3. Arrow function

When you create a function as a declaration or statement, it gets hoisted at the top of the execution context and can be used before it is made. Example below:

function Foo(){

return "Returned from function Foo";
}

When you create a function as an expression, it does not get hoisted at the top of the execution context and cannot be used before it is made. Example below:

var Koo = function Koo(){
return "Return from function Koo";
}

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