1510-function-cfus.md

JavaScript Functions

I can explain the difference between function declarations and function expressions.

• Yes and, Function declaration has a name....where as a function expression is saved as a variable. Function declarations are hoisted, and expressions are not....the variables that are storing the functions are hoisted, but they are undefined until the variable is actually defined.

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

• It is the global object.

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

• It is whatever object its being called from.

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

• use call. Only use it to explicitly set this....when passing in other arguments.
• use apply. Only use it to explicitly set this....when passing in other arguments when they are in an array.
• this hurts my brain

I can explain the difference between call and apply.

• Yes, see above.

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

• Sortof(ish)
• We don't want to actually call that function just yet (asynch stuff happening), but we do want to explicitly set this.

I can explain how bind works.

• Meh - Creates a new function where this has already been set