Support `for(index => value in array)` syntax in Haxe

ArrayUtils.hx

class ArrayUtils {
  /**
	   Support `for(index => value in array)` syntax.
	**/
	public static inline function keyValueIterator<A>(arr:Array<A>) {
		return new ArrayKeyValueIterator(arr);
	}
}

private class ArrayKeyValueIterator<T>{
	var index:Int = 0;
	final array:Array<T>;
	public inline function new(array:Array<T>) this.array = array;
	public inline function hasNext() return index < array.length;
	public inline function next() return { key: index, value: array[index ++] };
}

Test.hx

using ArrayUtils; // ← put this in the import.hx file in root of your project

class Test {
  static function main() {
    var array = ["a","b","c"];
    
    for(index => value in array) {
      trace('index=$index: value=$value');
    }
  }
}