how to get first three characters of an NSString?

Objective CCocoa

Objective C Problem Overview

How can I return the first three characters of an NSString?

Objective C Solutions

Solution 1 - Objective C

 mystr=[mystr substringToIndex:3];

Be sure your string has atleast 3 ch.. o.e. it will crash the app.

Here are some other links to check NSsting operations...

Link1

Link2

Apple Link

Solution 2 - Objective C

First, you have to make sure that the string contains at least 3 characters:

NSString *fullString = /* obtain from somewhere */;
NSString *prefix = nil;

if ([fullString length] >= 3)
    prefix = [fullString substringToIndex:3];
else
    prefix = fullString;

substringToIndex: will throw an exception if the index you provide is beyond the end of the string.

Solution 3 - Objective C

the right way is:

text = [text substringToIndex:NSMaxRange([text rangeOfComposedCharacterSequenceAtIndex:2])];

substringToIndex of NSString is indexing by code unit, emoji takes two code units.

make sure check the index yourself.

Categories
Recommended Objective C Solutions
Recommended Cocoa Solutions

Previous Solution:

How do I use Comparator to define a custom sort order?

JavaSortingEnums

Next Solution:

How to inspect Javascript Objects

JavascriptObjectInspect

Attributions

All content for this solution is sourced from the original question on Stackoverflow.

The content on this page is licensed under the Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionChristian GossainView Question on Stackoverflow
Solution 1 - Objective CGameLoadingView Answer on Stackoverflow
Solution 2 - Objective CdreamlaxView Answer on Stackoverflow
Solution 3 - Objective CpeakView Answer on Stackoverflow