Understanding the JavaScript Call Stack

What is a ‘call’?

is primarily used for function invocation (call). Since the call stack is single, function(s) execution, is done, one at a time, from top to bottom.

How many ‘calls’ can happen at once?

one call at a time

What does LIFO mean?

A data structure principle. This is the basic understanding of the call stack. Last In, First Out. The last function to go in, the first to come out.

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

```function greets(){ console.log(“greeets”); }

function test(){ greets(); console.log(“test func”); }

test();```

What causes a Stack Overflow?

rcursive function meaning a function that calls itself but does not have an exiting 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’?

undeclared variable.

What is a ‘syntax error’?

this occurs when you have something that cannot be parsed in terms of syntax ex : invalid object that you are trying to parse in a JSON file

What is a ‘range error’?

give it an invalid length ex : trying to return a negative position in an array will throw this error.

What is a ‘tyep error’?

data type (string, number, boolean, …) in not compatible. Like trying to access a property of variable that doesn’t exist.

What is a breakpoint?

The point were we will have the error

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

achieve The breakpoint by putting debugger in the line you want to break.