How to reduce blood sugar level immediately: It's actually the JavaScript array

It's actually the JavaScript array reduce function rather than being something specific to TypeScript. As described in the docs: Apply a function against an accumulator and each value of the array (from left- to -right) as to reduce it to a single value. Often I study some JavaScript interview questions, suddenly I saw a question about usage of reduce function for sorting an Array, I read about it in MDN and the usage of it in some medium articles... According to the functional paradigm you'd use either a reduce in continuation passing style or utilize lazy evaluation with a right-associative reduce . Or, as a simpler alternative, just plain recursion. Reduce (intersect,list(a,b,c,d,e)) I would greatly appreciate if someone could please explain to me how this statement works, because I have seen Reduce used in other scenarios.