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New: Make sure we can use String function ’startsWith’ and ’endsWith’ even if an older browser or Javascript engine is used.

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This commit is contained in:
Martin Carlberg
2017-06-26 15:50:08 +02:00
parent 6456809a72
commit b4263aa3ec
1 changed files with 21 additions and 0 deletions
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Objective-J/OldBrowserCompatibility.js
+21
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@@ -115,3 +115,24 @@ if (!Array.prototype.indexOf)
return -1;
};
}
// ECMAScript 6 has added this. It is copied from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String
if (!String.prototype.startsWith) {
String.prototype.startsWith = function(searchString, position){
position = position || 0;
return this.substr(position, searchString.length) === searchString;
};
}
// ECMAScript 6 has added this. It is copied from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String
if (!String.prototype.endsWith) {
String.prototype.endsWith = function(searchString, position) {
var subjectString = this.toString();
if (typeof position !== 'number' || !isFinite(position) || Math.floor(position) !== position || position > subjectString.length) {
position = subjectString.length;
}
position -= searchString.length;
var lastIndex = subjectString.indexOf(searchString, position);
return lastIndex !== -1 && lastIndex === position;
};
};