Add $.isNumeric()

Fixes madrobby#847
LEV7n · Jul 13, 2016 · 6ea6dd8 · 6ea6dd8
1 parent 0f2ab27
commit 6ea6dd8
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diff --git a/src/zepto.js b/src/zepto.js
@@ -343,6 +343,13 @@ var Zepto = (function() {
     return true
   }
 
+  $.isNumeric = function(val) {
+    var num = Number(val), type = typeof val
+    return val != null && type != 'boolean' &&
+      (type != 'string' || val.length) &&
+      !isNaN(num) && isFinite(num) || false
+  }
+
   $.inArray = function(elem, array, i){
     return emptyArray.indexOf.call(array, elem, i)
   }

diff --git a/test/zepto.html b/test/zepto.html
@@ -440,6 +440,27 @@ <h1>Zepto Core unit tests</h1>
         t.assertTrue($.isWindow($('iframe').get(0).contentWindow))
       },
 
+      testDollarIsNumeric: function(t){
+        t.assertTrue($.isNumeric( '-10' ))
+        t.assertTrue($.isNumeric( '0' ))
+        t.assertTrue($.isNumeric( 0xFF ))
+        t.assertTrue($.isNumeric( '0xFF' ))
+        t.assertTrue($.isNumeric( '8e5' ))
+        t.assertTrue($.isNumeric( '3.1415' ))
+        t.assertTrue($.isNumeric( +10 ))
+        t.assertTrue($.isNumeric( 0144 ))
+
+        t.assertFalse($.isNumeric( '-0x42' ), '-0x42')
+        t.assertFalse($.isNumeric( '7.2acdgs' ), '7.2acdgs')
+        t.assertFalse($.isNumeric( '' ), 'empty string')
+        t.assertFalse($.isNumeric( {} ), 'empty hash')
+        t.assertFalse($.isNumeric( NaN ), 'NaN')
+        t.assertFalse($.isNumeric( null ), 'null')
+        t.assertFalse($.isNumeric( true ), 'true')
+        t.assertFalse($.isNumeric( Infinity ), 'Infinity')
+        t.assertFalse($.isNumeric( undefined ), 'undefined')
+      },
+
       // test to see if we augment iOS 3.2 with String#trim()
       testTrim: function(t){
         t.assertEqual("blah", " blah ".trim())