export class Collections { public static jsArrayToNSArray(str: string[]): any { var arr = new Foundation.NSMutableArray(); if ("undefined" != typeof str) { for (var element in str) { arr.addObject(str[element]); } } return arr; } public static nsArrayToJSArray(a: any): string[] { var arr = []; if ("undefined" != typeof a) { for (var i = 0; i < a.count(); i++) { arr.push(a.objectAtIndex(i)); } } return arr; } }