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52 lines
1.5 KiB
TypeScript
52 lines
1.5 KiB
TypeScript
// Loaded from https://deno.land/x/ramda@v0.27.2/source/mergeWithKey.js
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import _curry3 from './internal/_curry3.js';
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import _has from './internal/_has.js';
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/**
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* Creates a new object with the own properties of the two provided objects. If
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* a key exists in both objects, the provided function is applied to the key
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* and the values associated with the key in each object, with the result being
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* used as the value associated with the key in the returned object.
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*
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* @func
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* @memberOf R
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* @since v0.19.0
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* @category Object
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* @sig ((String, a, a) -> a) -> {a} -> {a} -> {a}
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* @param {Function} fn
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* @param {Object} l
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* @param {Object} r
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* @return {Object}
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* @see R.mergeDeepWithKey, R.merge, R.mergeWith
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* @example
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*
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* let concatValues = (k, l, r) => k == 'values' ? R.concat(l, r) : r
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* R.mergeWithKey(concatValues,
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* { a: true, thing: 'foo', values: [10, 20] },
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* { b: true, thing: 'bar', values: [15, 35] });
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* //=> { a: true, b: true, thing: 'bar', values: [10, 20, 15, 35] }
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* @symb R.mergeWithKey(f, { x: 1, y: 2 }, { y: 5, z: 3 }) = { x: 1, y: f('y', 2, 5), z: 3 }
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*/
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var mergeWithKey = _curry3(function mergeWithKey(fn, l, r) {
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var result = {};
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var k;
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for (k in l) {
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if (_has(k, l)) {
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result[k] = _has(k, r) ? fn(k, l[k], r[k]) : l[k];
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}
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}
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for (k in r) {
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if (_has(k, r) && !(_has(k, result))) {
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result[k] = r[k];
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}
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}
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return result;
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});
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export default mergeWithKey;
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