Readings: In memory storage

Understanding the JavaScript Call Stack

• What is a ‘call’?
  The call stack is primarily used for function invocation (call).

• How many ‘calls’ can happen at once?
  Since the call stack is single, function(s) execution, is done, one at a time, from top to bottom. It means the call stack is synchronous.

• What does LIFO mean?
  Last In, First Out - the last function that gets pushed into the stack is the first to be pop out, when the function returns.

• Draw an example of a call stack and the functions that would need to be invoked to generate that call stack.
  ``` function firstFunction(){ console.log(“Hello from firstFunction”); }

function secondFunction(){ firstFunction(); console.log(“The end from secondFunction”); }

secondFunction(); ```

• What causes a Stack Overflow?
  A stack overflow occurs when there is a recursive function (a function that calls itself) without an exit point. The browser (hosting environment) has a maximum stack call that it can accomodate before throwing a stack error.

---

JavaScript error messages

• What is a ‘refrence error’?
  This Error ocurrs when you try to use a variable that is not yet declared

• What is a ‘syntax error’?
  occurs when you have something that cannot be parsed in terms of syntax

• What is a ‘range error’?
  occurs when you give an object invalid length.

• What is a ‘type error’?
  When the types (number, string and so on) you are trying to use or access are incompatible, like accessing a property in an undefined type of variable.

• What is a breakpoint?
  A breakpoint is an intentional stopping or pausing place in a program, put in place for debugging purposes. It is also sometimes simply referred to as a pause

• What does the word ‘debugger’ do in your code?
  It achieves the breakpoint -you can put a debugger statement in your code in the line you want to break.-