reading-notes
Class 10
Understanding JS call stack
Q. What is a ‘call’?
- A call is when a function is invoked
Q. How many ‘calls’ can happen at once?
- One at a time, hense why the call stack is synchronous.
Q. What does LIFO mean?
- Last In First Out.
Q. Draw an example of a call stack and the functions that would need to be invoked to generate that call stack.
Q. What causes a Stack Overflow?
- a stack overflow happens when a function calls itself with no endpoint, similar to an infinite loop.
JavaScript error messages
Q. What is a ‘reference error’?
- A reference error accures when a value usually declared with let or const is not defined anywhere in the code.
Q. What is a ‘syntax error’?
- A syntax error accures when a line was typed incorrectly or couldnt be parsed according to the language you are using.
Q. What is a ‘range error’?
- A range error accures when an array/object is given an invalid length, such as a negative length.
Q. What is a ‘type error’?
- A type error accures when you are trying to access a value inside a incompatible property, such as accessing a null/undefined property.
Q. What is a breakpoint?
- A breakpoint is a set point in your text editor that will stop the executed code.
Q. What does the word ‘debugger’ do in your code?
- A debugger is a tool used to go line by line to find the error in your code.