Objective-C methods that correspond to these JS methods?

What NSMutableArray methods correspond to the开发者_高级运维se Javascript Array methods?

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

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• 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:.