mirror of
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37 lines
1.0 KiB
JavaScript
37 lines
1.0 KiB
JavaScript
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"use strict";
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var nil = {}
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var owns = ({}).hasOwnProperty
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function rebase(result, parent, delta) {
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var key, current, previous, update
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for (key in parent) {
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if (owns.call(parent, key)) {
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previous = parent[key]
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update = owns.call(delta, key) ? delta[key] : nil
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if (previous === null) continue
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else if (previous === void(0)) continue
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else if (update === null) continue
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else if (update === void(0)) continue
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else result[key] = previous
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}
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}
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for (key in delta) {
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if (owns.call(delta, key)) {
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update = delta[key]
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current = owns.call(result, key) ? result[key] : nil
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if (current === update) continue
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else if (update === null) continue
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else if (update === void(0)) continue
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else if (current === nil) result[key] = update
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else if (typeof(update) !== "object") result[key] = update
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else if (typeof(current) !== "object") result[key] = update
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else result[key]= rebase({}, current, update)
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}
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}
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return result
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}
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module.exports = rebase
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