react app

react-app/node_modules/lodash/collection/sample.js

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+var baseRandom = require('../internal/baseRandom'),
+    isIterateeCall = require('../internal/isIterateeCall'),
+    toArray = require('../lang/toArray'),
+    toIterable = require('../internal/toIterable');
+
+/* Native method references for those with the same name as other `lodash` methods. */
+var nativeMin = Math.min;
+
+/**
+ * Gets a random element or `n` random elements from a collection.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to sample.
+ * @param {number} [n] The number of elements to sample.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {*} Returns the random sample(s).
+ * @example
+ *
+ * _.sample([1, 2, 3, 4]);
+ * // => 2
+ *
+ * _.sample([1, 2, 3, 4], 2);
+ * // => [3, 1]
+ */
+function sample(collection, n, guard) {
+  if (guard ? isIterateeCall(collection, n, guard) : n == null) {
+    collection = toIterable(collection);
+    var length = collection.length;
+    return length > 0 ? collection[baseRandom(0, length - 1)] : undefined;
+  }
+  var index = -1,
+      result = toArray(collection),
+      length = result.length,
+      lastIndex = length - 1;
+
+  n = nativeMin(n < 0 ? 0 : (+n || 0), length);
+  while (++index < n) {
+    var rand = baseRandom(index, lastIndex),
+        value = result[rand];
+
+    result[rand] = result[index];
+    result[index] = value;
+  }
+  result.length = n;
+  return result;
+}
+
+module.exports = sample;