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x/ramda/source/evolve.js

:ram: Practical functional Javascript
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import _curry2 from './internal/_curry2.js';import _isArray from './internal/_isArray.js';import _isObject from './internal/_isObject.js';

/** * Creates a new object by recursively evolving a shallow copy of `object`, * according to the `transformation` functions. All non-primitive properties * are copied by reference. * * A `transformation` function will not be invoked if its corresponding key * does not exist in the evolved object. * * @func * @memberOf R * @since v0.9.0 * @category Object * @sig {k: (v -> v)} -> {k: v} -> {k: v} * @param {Object} transformations The object specifying transformation functions to apply * to the object. * @param {Object} object The object to be transformed. * @return {Object} The transformed object. * @example * * const tomato = {firstName: ' Tomato ', data: {elapsed: 100, remaining: 1400}, id:123}; * const transformations = { * firstName: R.trim, * lastName: R.trim, // Will not get invoked. * data: {elapsed: R.add(1), remaining: R.add(-1)} * }; * R.evolve(transformations, tomato); //=> {firstName: 'Tomato', data: {elapsed: 101, remaining: 1399}, id:123} */var evolve = _curry2(function evolve(transformations, object) { if (!_isObject(object) && !_isArray(object)) { return object; } var result = object instanceof Array ? [] : {}; var transformation, key, type; for (key in object) { transformation = transformations[key]; type = typeof transformation; result[key] = type === 'function' ? transformation(object[key]) : transformation && type === 'object' ? evolve(transformation, object[key]) : object[key]; } return result;});export default evolve;