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How JavaScript works?

  • Everything in javascript happens inside an Execution Context.
  • Execution contexts consist of two components:-
    • Memory component.
    • Code component.
Memory component Code component
This is a place where all the variables and functions are stored as a key-value pairs. This is a place where whole js code is executed on line at a time
This memory component also known as variable environment. This code component also known as Thread of execution.
key: value a: 10 function: {**\_\_**}

SYNCHRONOUS SINGLE THREADED LANGUAGE

  • JavaScript is a SYNCHRONOUS SINGLE THREADED LANGUAGE i.e. JavaScript can only execute one command at a time, in a specific order. So, that means it can only go to the next line once the current line is executed.