Null vs undefined

console.log(“hello”);
output:
hello
undefined
// it returns undefined after hello, because console.log() is a function and its not returning anything, so the return value would be undefined.

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in JavaScript, if a function doesn’t explicitly return anything, its return value is automatically undefined.

var str=”hello”;
str.match(“Hi”);
output: null
here match() function should always return something. this time “hello” does not match with “Hi” so it is returning null.

undefined vs null
undefined = never got anything.
null = got something… and that something is nothing.