Add _.fill.

lodash.src.js

@@ -2027,6 +2027,36 @@
       return result;
     }
 
+    /**
+     * The base implementation of `_.fill` without an iteratee call guard.
+     *
+     * @private
+     * @param {Array} array The array to fill.
+     * @param {*} value The value to fill `array` with.
+     * @param {number} [start=0] The start position.
+     * @param {number} [end=array.length] The end position.
+     * @returns {Array} Returns `array`.
+     */
+    function baseFill(array, value, start, end) {
+      var length = array.length;
+
+      start = start == null ? 0 : (+start || 0);
+      if (start < 0) {
+        start = -start > length ? 0 : (length + start);
+      }
+      end = (typeof end == 'undefined' || end > length) ? length : (+end || 0);
+      if (end < 0) {
+        end += length;
+      }
+      length = start > end ? 0 : end >>> 0;
+      start >>>= 0;
+
+      while (start < length) {
+        array[start++] = value;
+      }
+      return array;
+    }
+
     /**
      * The base implementation of `_.filter` without support for callback
      * shorthands or `this` binding.
@@ -4365,6 +4395,29 @@
       return baseSlice(array, index);
     }
 
+    /**
+     * Fills elements of `array` with `value` from `start` up to, but not
+     * including, `end`.
+     *
+     * @private
+     * @param {Array} array The array to fill.
+     * @param {*} value The value to fill `array` with.
+     * @param {number} [start=0] The start position.
+     * @param {number} [end=array.length] The end position.
+     * @returns {Array} Returns `array`.
+     */
+    function fill(array, value, start, end) {
+      var length = array ? array.length : 0;
+      if (!length) {
+        return [];
+      }
+      if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {
+        start = 0;
+        end = length;
+      }
+      return baseFill(array, value, start, end);
+    }
+
     /**
      * This method is like `_.find` except that it returns the index of the first
      * element `predicate` returns truthy for, instead of the element itself.
@@ -10747,6 +10800,7 @@
     lodash.dropRight = dropRight;
     lodash.dropRightWhile = dropRightWhile;
     lodash.dropWhile = dropWhile;
+    lodash.fill = fill;
     lodash.filter = filter;
     lodash.flatten = flatten;
     lodash.flattenDeep = flattenDeep;