The concept of compose
is simple — it combines n functions. It’s a pipe flowing right-to-left, calling each function with the output of the last one.
Array.prototype.reduceRight = function (...args) {
const _this = this
return _this.reverse().reduce(...args)
}
const compose = (...args) => x => args.reduceRight((acc, currFn)=>{
return currFn(acc)
}, x)
const double = x => x * 2
const inc = x => x + 1
const incAndOct = compose(double, double, double, inc)
incAndOct(2) //24
Explanation:
we are passing 2
to incAndOct
function. First it will call inc
method then the result will be 3
and next it will apply double method on 3
so result is 6
again one more double but this time on double(3)
i.e 6
result is 12 now final double on 12
it is 24
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