1510-function-cfus.md

JavaScript Functions

I can explain the difference between function declarations and function expressions.
-Yes. Declarations are hoisted and available right away, while expression values are undefined until they are declared.

I can explain what the value of this is in a normal function.

• The global ojbect.

I can explain what the value of this is when called from the context of an object.

• The object in which it was called.

I can explain how to explicitly set the value of this in a function.

• Using call we can set the value of this as the first argument. Or 'apply' takes an array of of the normal arguments.

I can explain the difference between call and apply.
-They both all this to be set as the first argument, but all then takes a series of arguments, while apply takes an array.

I can describe an case where I might need to use bind to avoid polluting the global scope.

• When making an AJAX call to get the desired data

I can explain how bind works.

• Creates a new function where this is carried over. It's a way to pass the context of this.