src/vs/base/common/diff/diff.ts/MyArray/Copy
class MyArray:	public static Copy(sourceArray: any[], sourceIndex: number, destinationArray: any[], destinationIndex: number, length: number) {
		for (let i = 0; i < length; i++) {
			destinationArray[destinationIndex + i] = sourceArray[sourceIndex + i];
		}
	}