eris-keys
Version:
a JavaScript client library for eris-keys
45 lines (42 loc) • 1.76 kB
JavaScript
var _curry1 = require('./internal/_curry1');
var apply = require('./apply');
var curryN = require('./curryN');
var map = require('./map');
var max = require('./max');
var pluck = require('./pluck');
var reduce = require('./reduce');
var values = require('./values');
/**
* Given a spec object recursively mapping properties to functions, creates a
* function producing an object of the same structure, by mapping each property
* to the result of calling its associated function with the supplied arguments.
*
* @func
* @memberOf R
* @since v0.20.0
* @category Function
* @sig {k: ((a, b, ..., m) -> v)} -> ((a, b, ..., m) -> {k: v})
* @param {Object} spec an object recursively mapping properties to functions for
* producing the values for these properties.
* @return {Function} A function that returns an object of the same structure
* as `spec', with each property set to the value returned by calling its
* associated function with the supplied arguments.
* @see R.converge, R.juxt
* @example
*
* var getMetrics = R.applySpec({
* sum: R.add,
* nested: { mul: R.multiply }
* });
* getMetrics(2, 4); // => { sum: 6, nested: { mul: 8 } }
* @symb R.applySpec({ x: f, y: { z: g } })(a, b) = { x: f(a, b), y: { z: g(a, b) } }
*/
module.exports = _curry1(function applySpec(spec) {
spec = map(function(v) { return typeof v == 'function' ? v : applySpec(v); },
spec);
return curryN(reduce(max, 0, pluck('length', values(spec))),
function() {
var args = arguments;
return map(function(f) { return apply(f, args); }, spec);
});
});