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65 lines
2.0 KiB
TypeScript
65 lines
2.0 KiB
TypeScript
// Loaded from https://deno.land/x/ramda@v0.27.2/source/applySpec.js
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import _curry1 from './internal/_curry1.js';
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import _isArray from './internal/_isArray.js';
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import apply from './apply.js';
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import curryN from './curryN.js';
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import max from './max.js';
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import pluck from './pluck.js';
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import reduce from './reduce.js';
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import keys from './keys.js';
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import values from './values.js';
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// Use custom mapValues function to avoid issues with specs that include a "map" key and R.map
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// delegating calls to .map
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function mapValues(fn, obj) {
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return _isArray(obj)
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? obj.map(fn)
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: keys(obj).reduce(function(acc, key) {
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acc[key] = fn(obj[key]);
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return acc;
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}, {});
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}
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/**
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* Given a spec object recursively mapping properties to functions, creates a
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* function producing an object of the same structure, by mapping each property
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* to the result of calling its associated function with the supplied arguments.
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*
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* @func
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* @memberOf R
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* @since v0.20.0
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* @category Function
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* @sig {k: ((a, b, ..., m) -> v)} -> ((a, b, ..., m) -> {k: v})
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* @param {Object} spec an object recursively mapping properties to functions for
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* producing the values for these properties.
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* @return {Function} A function that returns an object of the same structure
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* as `spec', with each property set to the value returned by calling its
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* associated function with the supplied arguments.
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* @see R.converge, R.juxt
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* @example
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*
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* const getMetrics = R.applySpec({
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* sum: R.add,
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* nested: { mul: R.multiply }
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* });
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* getMetrics(2, 4); // => { sum: 6, nested: { mul: 8 } }
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* @symb R.applySpec({ x: f, y: { z: g } })(a, b) = { x: f(a, b), y: { z: g(a, b) } }
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*/
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var applySpec = _curry1(function applySpec(spec) {
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spec = mapValues(
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function(v) { return typeof v == 'function' ? v : applySpec(v); },
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spec
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);
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return curryN(
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reduce(max, 0, pluck('length', values(spec))),
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function() {
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var args = arguments;
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return mapValues(function(f) { return apply(f, args); }, spec);
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});
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});
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export default applySpec;
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