Expose _.isLength.

lodash.js

@@ -1122,19 +1122,6 @@
     return value > -1 && value % 1 == 0 && value < length;
   }
 
-  /**
-   * Checks if `value` is a valid array-like length.
-   *
-   * **Note:** This function is based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
-   *
-   * @private
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
-   */
-  function isLength(value) {
-    return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
-  }
-
   /**
    * Used by `trimmedLeftIndex` and `trimmedRightIndex` to determine if a
    * character code is whitespace.
@@ -1480,8 +1467,8 @@
      * `head`, `identity`, `includes`, `indexOf`, `inRange`, `isArguments`, `isArray`,
      * `isArrayLike`, `isArrayLikeObject`, `isBoolean`, `isDate`, `isElement`,
      * `isEmpty`, `isEqual`, `isEqualWith`, `isError`, `isFinite`, `isFunction`,
-     * `isInteger`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,
-     * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,
+     * `isInteger`, `isLength`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`,
+     * `isNull`, `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,
      * `isSafeInteger`, `isString`, `isUndefined`, `isTypedArray`, `join`, `kebabCase`,
      * `last`, `lastIndexOf`, `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `min`,
      * `noConflict`, `noop`, `now`, `pad`, `padLeft`, `padRight`, `parseInt`, `pop`,
@@ -9318,6 +9305,21 @@
       return typeof value == 'number' && value == toInteger(value);
     }
 
+    /**
+     * Checks if `value` is a valid array-like length.
+     *
+     * **Note:** This function is based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
+     */
+    function isLength(value) {
+      return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
+    }
+
     /**
      * Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`.
      * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
@@ -13428,6 +13430,7 @@
     lodash.isFinite = isFinite;
     lodash.isFunction = isFunction;
     lodash.isInteger = isInteger;
+    lodash.isLength = isLength;
     lodash.isMatch = isMatch;
     lodash.isMatchWith = isMatchWith;
     lodash.isNaN = isNaN;

test/test.js

@@ -572,7 +572,7 @@
 
     if (isModularize && !(amd || isNpm)) {
       lodashStable.each(['internal/baseEach', 'internal/isIndex',
-              'internal/isIterateeCall', 'internal/isLength'], function(relPath) {
+              'internal/isIterateeCall'], function(relPath) {
         var func = require(path.join(basePath, relPath)),
             funcName = path.basename(relPath);
 
@@ -829,41 +829,6 @@
 
   /*--------------------------------------------------------------------------*/
 
-  QUnit.module('isLength');
-
-  (function() {
-    var func = _._isLength;
-
-    QUnit.test('should return `true` for lengths', function(assert) {
-      assert.expect(3);
-
-      if (func) {
-        assert.strictEqual(func(0), true);
-        assert.strictEqual(func(3), true);
-        assert.strictEqual(func(MAX_SAFE_INTEGER), true);
-      }
-      else {
-        skipTest(assert, 3);
-      }
-    });
-
-    QUnit.test('should return `false` for non-lengths', function(assert) {
-      assert.expect(4);
-
-      if (func) {
-        assert.strictEqual(func(-1), false);
-        assert.strictEqual(func('1'), false);
-        assert.strictEqual(func(1.1), false);
-        assert.strictEqual(func(MAX_SAFE_INTEGER + 1), false);
-      }
-      else {
-        skipTest(assert, 4);
-      }
-    });
-  }());
-
-  /*--------------------------------------------------------------------------*/
-
   QUnit.module('lodash constructor');
 
   (function() {
@@ -8599,6 +8564,33 @@
 
   /*--------------------------------------------------------------------------*/
 
+  QUnit.module('lodash.isLength');
+
+  /*--------------------------------------------------------------------------*/
+
+  QUnit.module('isLength');
+
+  (function() {
+    QUnit.test('should return `true` for lengths', function(assert) {
+      assert.expect(3);
+
+      assert.strictEqual(_.isLength(0), true);
+      assert.strictEqual(_.isLength(3), true);
+      assert.strictEqual(_.isLength(MAX_SAFE_INTEGER), true);
+    });
+
+    QUnit.test('should return `false` for non-lengths', function(assert) {
+      assert.expect(4);
+
+      assert.strictEqual(_.isLength(-1), false);
+      assert.strictEqual(_.isLength('1'), false);
+      assert.strictEqual(_.isLength(1.1), false);
+      assert.strictEqual(_.isLength(MAX_SAFE_INTEGER + 1), false);
+    });
+  }());
+
+  /*--------------------------------------------------------------------------*/
+
   QUnit.module('lodash.isMatch');
 
   (function() {
@@ -22028,7 +22020,7 @@
     var acceptFalsey = lodashStable.difference(allMethods, rejectFalsey);
 
     QUnit.test('should accept falsey arguments', function(assert) {
-      assert.expect(272);
+      assert.expect(273);
 
       var emptyArrays = lodashStable.map(falsey, lodashStable.constant([]));