Currying in JavaScript

Function currying is way to use same arguments in the sequence of functions.

function someFunction(radius,numberOfCircles){
  const area = Math.PI * radius * radius
  return function (){
    const totalArea = area * numberOfCircles
    return totalArea
   }
}
const heavyFunctionProcessed = someFunction(5)
const totalAreaOF3Circles = heavyFunctionProcessed(3)
const totalAreaOF4Circles = heavyFunctionProcessed(4)
...

Above is the example of function currying in javascript.

someFunction is returning another (anonymous ) function and we are using that on other places.

Benefit

We have called heavyFunctionProcessed 2 times but the calculations for area was done only once. So this way cpu took less processing and our code is effecient.

Drawback

As we saw area value was processed once and then Javascript store its value for future. This way we are not repeating the same calculations but we are occupying space in memory. So for this reason currying functions can take more space.

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