reading-notes

In Memory Storage

Understanding the JS callstack

• What is a ‘call’?
  • function invocation
• How many ‘calls’ can happen at once?
  • one
• What does LIFO mean?
  • Last in first out

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

  • firstfunction
  • secondfunction

  • thirdfunction

  • function firstFunction(){ throw new Error(‘Stack Trace Error’); }

    function secondFunction(){ firstFunction(); }

    function thirdFunction(){ secondFunction(); }

    thirdFunction();

• What causes a Stack Overflow?
  • the browser/hosting environment has a maximum stack call that it can accommodate before throwing a stack error
  • recursive functions without an exit point can/will blow the stack

JS Error messages

• What is a ‘reference error’?
  • use of a variable that is not yet declared
• What is a ‘syntax error’?
  • use of something that cannot be parsed in terms of syntax
• What is a ‘range error’?
  • manipulate an object with some kind of length and give it an invalid length
• What is a ‘type error’?
  • show up when the types (number, string and so on) you are trying to use or access are incompatible
• What is a breakpoint?
  • cam be added to stop your code execution at that point
• What does the word ‘debugger’ do in your code?
  • adds a break point

Things I Wish I Knew More About

References

• JS callstack
• JS Errors