converge

JavaScript, Function

Accepts a converging function and a list of branching functions and returns a function that applies each branching function to the arguments and the results of the branching functions are passed as arguments to the converging function.

  • Use Array.prototype.map() and Function.prototype.apply() to apply each function to the given arguments.
  • Use the spread operator (...) to call converger with the results of all other functions.
const converge = (converger, fns) => (...args) =>
  converger(...fns.map(fn => fn.apply(null, args)));
const average = converge((a, b) => a / b, [
  arr => arr.reduce((a, v) => a + v, 0),
  arr => arr.length
]);
average([1, 2, 3, 4, 5, 6, 7]); // 4

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