add is-regexp function and tests

README.md

@@ -294,6 +294,16 @@ var isObject = require('101/is-object');
 [{}, { foo: 1 }, 100].map(isObject); // [true, true, false]
 ```
 
+## isRegExp
+
+Check if a value is an instance of RegExp
+
+```js
+var isRegExp = require('101/is-regexp');
+
+[new RegExp('.*'), /.*/, {}, 1].map(isRegExp); // [true, true, false, false]
+```
+
 ## isString
 
 Functional version of val typeof 'string'

is-regexp.js

@@ -0,0 +1,18 @@
+/**
+ * @module 101/is-regexp
+ */
+
+/**
+ * Check if a value is an instance of RegExp
+ * @function module:101/is-regexp
+ * @param {*} val - value checked to be an instance of RegExp
+ * @return {boolean} Whether the value is an object or not
+ */
+var exists = require('./exists');
+
+module.exports = function isRegExp (val) {
+  return typeof val === 'object' &&
+    exists(val) &&
+    Object.prototype.toString.call(val) == '[object RegExp]';
+};
+

pick.js

@@ -3,6 +3,7 @@
  */
 
 var isObject = require('./is-object');
+var isRegExp = require('./is-regexp');
 
 /**
  * Returns a new object with the specified keys (with key values from obj).
@@ -50,7 +51,3 @@ function copy (from, to) {
     }
   };
 }
-
-function isRegExp (obj) {
-  return Object.prototype.toString.call(obj) == '[object RegExp]';
-}

test/test-isregexp.js

@@ -0,0 +1,30 @@
+var Lab = require('lab');
+var lab = exports.lab = Lab.script();
+
+var describe = lab.describe;
+var it = lab.it;
+var expect = Lab.expect;
+
+var isRegExp = require('../is-regexp');
+
+describe('isRegExp', function () {
+  it('should return true for instance of RegExp', function(done) {
+    var regexp = new RegExp('.*');
+    expect(isRegExp(regexp)).to.be.true;
+    expect(isRegExp(/.*/)).to.be.true;
+    done();
+  });
+
+  it('should return false for non-regexp', function(done) {
+    expect(isRegExp({})).to.be.false;
+    expect(isRegExp(['foo'])).to.be.false;
+    expect(isRegExp('foo')).to.be.false;
+    expect(isRegExp(101)).to.be.false;
+    expect(isRegExp(function () {})).to.be.false;
+    expect(isRegExp(null)).to.be.false;
+    expect(isRegExp(undefined)).to.be.false;
+    expect(isRegExp(new String('hey'))).to.be.false;
+    expect(isRegExp(new Number(101))).to.be.false;
+    done();
+  });
+});