Theo's Typesafe Cult•7d ago

closure in javascript

so i am learning javascript and i came across a section that side we should generally try to avoid side effect but upon reaching the closure part it seems like every closure i have seen has side effect so my question is in what cases should we use closure ?

2 Replies

Aleed.devOP•7d ago

also please if anyone can explaint this to me

function multiplier(factor) {
  return number => number * factor;
}

let twice = multiplier(2);
console.log(twice(5));

function multiplier(factor) {
  return number => number * factor;
}

let twice = multiplier(2);
console.log(twice(5));

i can't still wrap my head around it

hari_07•6d ago

Avoiding closures part is like many code things just partially true, comes down to the specific use cases but if the intention and effects are clear doesn't hurt to use if it helps the code be more concise As for the snippet you've shared, number => number * factor , is just a shorthand for function (number) { return number * factor } So essentially the multiplier function takes in a factor and returns a function with factor baked in as the multiplier So when you do twice. = multiplier(2), twice is now (number) { return number * 2} So twice(5) will give you 10

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