NSString's Substring Crash Course 

    NSString * s1 = @"abc1234";
    NSLog(@"s1 = %@",s1);
    NSLog(@"substringFromIndex,4 : %@",[s1 substringFromIndex:4]);
    
    NSLog(@"substringToIndex,4 : %@",[s1 substringToIndex:4]);
    
    NSLog(@"substringWithRange,NSMakeRange,2,4 : %@",[s1 substringWithRange:NSMakeRange(2, 4)]);
    
    NSRange indexOfString = [s1 rangeOfString:@"bc"];
    NSLog(@"substringFromIndex,indexOfString,bc : %@",[s1 substringFromIndex:indexOfString.location]);

Will Produce the following output:

s1 = abc1234
substringFromIndex,4 : 234
substringToIndex,4 : abc1
substringWithRange,NSMakeRange,2,4 : c123
substringFromIndex,indexOfString,bc : bc1234

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