Bump to v4.0.0.

sampleSize.js

@@ -0,0 +1,36 @@
+define(['./internal/baseClamp', './internal/baseRandom', './toArray', './toInteger'], function(baseClamp, baseRandom, toArray, toInteger) {
+
+  /**
+   * Gets `n` random elements from `collection`.
+   *
+   * @static
+   * @memberOf _
+   * @category Collection
+   * @param {Array|Object} collection The collection to sample.
+   * @param {number} [n=0] The number of elements to sample.
+   * @returns {Array} Returns the random elements.
+   * @example
+   *
+   * _.sampleSize([1, 2, 3, 4], 2);
+   * // => [3, 1]
+   */
+  function sampleSize(collection, n) {
+    var index = -1,
+        result = toArray(collection),
+        length = result.length,
+        lastIndex = length - 1;
+
+    n = baseClamp(toInteger(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;
+  }
+
+  return sampleSize;
+});