Objective-C methods that correspond to these JS methods?

Question

NSMutableArray方法对应于这些Javascript Array方法？

• shift();
• unshift();
• slice();
• splice();

Answer 1

• shift is a combination of -objectAtIndex:0 and removeObjectAtIndex:0 .
• unshift is insertObject:obj atIndex:0 . It does not return the new length, however.
• slice is -[NSString substringWithRange:]
• splice has no equivalent, though you can approximate it with insertObjects:atIndexes: .