evolve.js•1.54 kB
var _curry2 = require('./internal/_curry2');
/**
* 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
*
* var tomato = {firstName: ' Tomato ', data: {elapsed: 100, remaining: 1400}, id:123};
* var 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}
*/
module.exports = _curry2(function evolve(transformations, object) {
var result = {};
var transformation, key, type;
for (key in object) {
transformation = transformations[key];
type = typeof transformation;
result[key] = type === 'function' ? transformation(object[key])
: type === 'object' ? evolve(transformations[key], object[key])
: object[key];
}
return result;
});