Avoid isNaN

mathiasbynens · mathiasbynens · commit e1d8a801000b · 2013-12-19T18:59:30.000+01:00
diff --git a/codepointat.js b/codepointat.js
@@ -9,7 +9,7 @@ if (!String.prototype.codePointAt) {
 		var size = string.length;
 		// `ToInteger`
 		var index = position ? Number(position) : 0;
-		if (isNaN(index)) {
+		if (index != index) { // better `isNaN`
 			index = 0;
 		}
 		// Account for out-of-bounds indices:

Original file line number	Diff line number	Diff line change
`@@ -9,7 +9,7 @@ if (!String.prototype.codePointAt) {`
`9`	`9`	`var size = string.length;`
`10`	`10`	// `ToInteger`
`11`	`11`	`var index = position ? Number(position) : 0;`
`12`		`- if (isNaN(index)) {`
	`12`	+ if (index != index) { // better `isNaN`
`13`	`13`	`index = 0;`
`14`	`14`	`}`
`15`	`15`	`// Account for out-of-bounds indices:`