Bump to v4.0.0.

isInteger.js

@@ -0,0 +1,32 @@
+define(['./toInteger'], function(toInteger) {
+
+  /**
+   * Checks if `value` is an integer.
+   *
+   * **Note:** This method is based on [`Number.isInteger`](https://mdn.io/Number/isInteger).
+   *
+   * @static
+   * @memberOf _
+   * @category Lang
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is an integer, else `false`.
+   * @example
+   *
+   * _.isInteger(3);
+   * // => true
+   *
+   * _.isInteger(Number.MIN_VALUE);
+   * // => false
+   *
+   * _.isInteger(Infinity);
+   * // => false
+   *
+   * _.isInteger('3');
+   * // => false
+   */
+  function isInteger(value) {
+    return typeof value == 'number' && value == toInteger(value);
+  }
+
+  return isInteger;
+});