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@@ -1,3 +1,13 @@
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+/**
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+ * Creates a function which extracts some properties out of an object.
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+ *
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+ * @typedef {function} extractProps
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+ *
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+ * @memberOf object
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+ * @param {string[]} props
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+ * @return {function(obj: Object)}
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+ */
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+
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const extract = (...props) => (obj) => {
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return props.reduce((extracted, key) => {
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extracted[key] = obj[key];
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