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JavaScript Topics

Function Parameters

Defined in the function declaration.

function greet(name) {
  console.log("Hi " + name);
}
      

Function Arguments

Actual values passed to the function call.

greet("Rahul"); // "Rahul" is the argument
      

Types of Scopes

• Global Scope

  let x = 5;
  function show() {
    console.log(x);
  }
            

• Function Scope

  function test() {
    let y = 10;
    console.log(y);
  }
  console.log(y); // Error
            

Closure Function

Inner function accessing outer function’s variables after outer function is done.

function outer() {
  let count = 0;
  return function inner() {
    count++;
    console.log(count);
  }
}
const inc = outer();
inc(); // 1
inc(); // 2