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Filename : converge.js
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import _curry2 from "./internal/_curry2.js";
import _map from "./internal/_map.js";
import curryN from "./curryN.js";
import max from "./max.js";
import pluck from "./pluck.js";
import reduce from "./reduce.js";
/**
 * Accepts a converging function and a list of branching functions and returns
 * a new function. The arity of the new function is the same as the arity of
 * the longest branching function. When invoked, this new function is applied
 * to some arguments, and each branching function is applied to those same
 * arguments. The results of each branching function are passed as arguments
 * to the converging function to produce the return value.
 *
 * @func
 * @memberOf R
 * @since v0.4.2
 * @category Function
 * @sig ((x1, x2, ...) -> z) -> [((a, b, ...) -> x1), ((a, b, ...) -> x2), ...] -> (a -> b -> ... -> z)
 * @param {Function} after A function. `after` will be invoked with the return values of
 *        `fn1` and `fn2` as its arguments.
 * @param {Array} functions A list of functions.
 * @return {Function} A new function.
 * @see R.useWith
 * @example
 *
 *      const average = R.converge(R.divide, [R.sum, R.length])
 *      average([1, 2, 3, 4, 5, 6, 7]) //=> 4
 *
 *      const strangeConcat = R.converge(R.concat, [R.toUpper, R.toLower])
 *      strangeConcat("Yodel") //=> "YODELyodel"
 *
 * @symb R.converge(f, [g, h])(a, b) = f(g(a, b), h(a, b))
 */

var converge =
/*#__PURE__*/
_curry2(function converge(after, fns) {
  return curryN(reduce(max, 0, pluck('length', fns)), function () {
    var args = arguments;
    var context = this;
    return after.apply(context, _map(function (fn) {
      return fn.apply(context, args);
    }, fns));
  });
});

export default converge;