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39 lines
1.1 KiB
39 lines
1.1 KiB
2 years ago
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var optimizeCb = require('./optimizeCb');
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var isArrLike = require('./isArrLike');
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var isUndef = require('./isUndef');
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var keys = require('./keys');
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exports = createReduce(1);
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exports.create = createReduce;
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function createReduce(dir) {
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return function(obj, iterator, initial, ctx) {
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iterator = optimizeCb(iterator, ctx);
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var i, len, key;
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if (isArrLike(obj)) {
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len = obj.length;
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i = dir > 0 ? 0 : len - 1;
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if (isUndef(initial)) {
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initial = obj[i];
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i += dir;
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}
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for (; i < len && i >= 0; i += dir) {
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initial = iterator(initial, obj[i], i, obj);
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}
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} else {
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var _keys = keys(obj);
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len = _keys.length;
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i = dir > 0 ? 0 : len - 1;
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if (isUndef(initial)) {
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initial = obj[_keys[i]];
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i += dir;
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}
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for (; i < len && i >= 0; i += dir) {
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key = _keys[i];
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initial = iterator(initial, obj[key], key, obj);
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}
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}
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return initial;
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};
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}
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module.exports = exports;
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