In memory storage

Understanding the JavaScript Call Stack

 

1. What is a ‘call’?

function invocation.

 

2. How many ‘calls’ can happen at once?

one, since the javascript engine is single-threaded.

 

3. What does LIFO mean?

Last In, First Out (LIFO), which temporarily stores and manages function invocation (call), and solves the last function that was called .

 

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

to get this error in console

will look like this

function firstFunction(){
  throw new Error('Stack Trace Error');
}

function secondFunction(){
  firstFunction();
}

function thirdFunction(){
  secondFunction();
}

thirdFunction();

 

5. What causes a Stack Overflow?

the function that calls itself without the need of an exit point.

 

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JavaScript error messages

1. What is a ‘reference error’?

It’s when you try to reference something that wasn’t declared yet.

 

2. What is a ‘syntax error’?

this occurs when you have something that cannot be parsed in terms of syntax, like when you try to parse an invalid object using JSON.parse.

 

3. What is a ‘range error’?

Try to manipulate an object with some kind of length and give it an invalid length and this kind of errors will show up.

 

4. What is a ‘type error’?

this types of errors show up 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.

 

5. What is a breakpoint?

It’s where the code will stop when you are debugging it.

 

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

add a breakpoint.

 

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