Understanding the JavaScript Call Stack

What is a ‘call’?

• This is a function invocation that uses the method .call();

How many ‘calls’ can happen at once?

• Javascript is only able to process one call at a time

What does LIFO mean?

• Last In First Out this means that last function pushed into the call stack is the first function returned

Draw an example of a call stack and the functions that would need to be invoked to generate that call stack

What causes a Stack Overflow?

• A stack overflow occurs when there is a recursive function (a function that calls itself) without an exit point

JavaScript error messages

What is a ‘reference error’?

• Trying to use a variable that has not yet been referenced

What is a ‘syntax error’?

• Errors related to the improper use of syntax

What is a ‘range error’?

• Manipulating an object that has a defined length and attempting to pass it an invalid length

What is a ‘type error’?

• Theses are errors that occur when the type of object that you are trying to manipulate is of the wrong type

What is a breakpoint?

• You set breakpoints wherever you want to pause debugger execution

What does the word ‘debugger’ do in your code?

• Debugging means to run your code step by step in a debugging tool like Visual Studio, to find the exact point where you made a programming mistake.

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JavaScript errors reference on MDN