Things I want to know more about

Readings: In memory storage

What is a ‘call’?

• Answer: invocing the functions, a call stack is a data structure that uses the Last In, First Out (LIFO) principle to temporarily store and manage function invocation (call).

How many ‘calls’ can happen at once?

• Answer: one at a time

What does LIFO mean’?

• Answer: data structure principle of 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.’?

• Answer:

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

function secondFunction(){
  firstFunction();
}

function thirdFunction(){
  secondFunction();
}

thirdFunction();

What causes a Stack Overflow?

• Answer: 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.

function callMyself(){
  callMyself();
}

callMyself();

summary

1. It is single-threaded. Meaning it can only do one thing at a time.
2. Code execution is synchronous.
3. A function invocation creates a stack frame that occupies a temporary memory.
4. It works as a LIFO — Last In, First Out data structur

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What is a ‘refrence error’?

• Answer: when try to use a variable that is not yet declared

What is a ‘syntax error’?

• Answer: 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.

What is a ‘range error’?

• Answer: when you try manipulate an object with some kind of length and give it an invalid length and this kind of errors will show up.

What is a ‘tyep error?

• Answer: like accessing a property in an undefined type of variable.

What is a breakpoint?

• Answer: it is a point to stop the code when the execution reaches it.

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

• Answer: to let you see the “history” before reaching that breakpoint.