JS 101 - Part 1 : Execution Context Explained Simply

JavaScript is the duct tape of the Internet. — Charlie Campbell

Everything in JS happens inside Execution Context.

but what the hell is execution context, given diagram below is execution context
it has two parts
memory creation phase : aka Variable Environment
code execution phase : aka Thread of Execution

More in Part 2

on internet or in interview question you heard of - is JavaScript synchronous or asynchronous, single-threaded or multi-threaded language ??

Answer : By Default JavaScript is synchronous and single-threaded language.
but what does this mean -
synchronous : line by line , wait for previous line to finish then next line ( aka top to bottom )
single-threaded : it can execute one line at a time not multi.

Important :
JavaScript can also handle asynchronous operations using callbacks, promises, async/await, etc. This happens with the help of the JavaScript runtime environment and the event loop.

but don't stress about this now , we will explain in very simple in future articles.

move to JavaScript 101 - Part 2 →