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x/ramda/applySpec.js

:ram: Practical functional Javascript
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import _curry1 from './internal/_curry1';import apply from './apply';import curryN from './curryN';import max from './max';import pluck from './pluck';import reduce from './reduce';import keys from './keys';import values from './values';
// Use custom mapValues function to avoid issues with specs that include a "map" key and R.map// delegating calls to .mapfunction mapValues(fn, obj) { return keys(obj).reduce(function(acc, key) { acc[key] = fn(obj[key]); return acc; }, {});}
/** * 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 * * const 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) } } */var applySpec = _curry1(function applySpec(spec) { spec = mapValues( function(v) { return typeof v == 'function' ? v : applySpec(v); }, spec );
return curryN( reduce(max, 0, pluck('length', values(spec))), function() { var args = arguments; return mapValues(function(f) { return apply(f, args); }, spec); });});export default applySpec;