How to convert a JavaScript array to a NSArray in Objective-C/iOS?

Question

What's the best way to convert a JavaScript array (saved in an NSString) with this format:

["Hello", "World"]

in an NSArray?

Thanks

If it is valid JSON (which it is in this case), you can use a/the JSON parser. Are you sure the content can be any JavaScript (array), or will it actually be always JSON? — Felix Kling
– Felix Kling, Commented Jun 18, 2014 at 20:54
Thanks for the suggestion, I solved parsing the JSON/JS array, I posted the code below. — mcont
– mcont, Commented Jun 18, 2014 at 21:00

mcont · Accepted Answer · 2014-06-18 20:57:54Z

2

As Felix suggested, a JavaScript array is actually a JSON array.

So I solved doing some JSON parsing. Thank you!

NSError *e;
NSArray* json = [NSJSONSerialization
                              JSONObjectWithData:[arrayString dataUsingEncoding:NSUTF8StringEncoding]
                              options:NSJSONReadingMutableContainers
                              error:&e];

answered Jun 18, 2014 at 20:57

mcont

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LLIAJLbHOu · Accepted Answer · 2014-06-18 21:25:29Z

1

Try this!

NSString * jsonString = @"[\"Hello\",\"World\"]";
NSError * serializationError = nil;
NSArray * array = [NSJSONSerialization JSONObjectWithData:[jsonString dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingAllowFragments error:&serializationError];
NSLog(@"NSArray - %@ \n error - %@", array, serializationError.localizedDescription);

Log:

NSArray - ( Hello, World ) error - (null)

edited Jun 18, 2014 at 21:25

answered Jun 18, 2014 at 21:17

LLIAJLbHOu

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3 Comments

mcont Over a year ago

Thanks, what is the meaning of the AllowFragments option?

LLIAJLbHOu Over a year ago

NSJSONReadingAllowFragments - Specifies that the parser should allow top-level objects that are not an instance of NSArray or NSDictionary.

mcont Over a year ago

So does it mean that the parser can recognize the two objects of the array as strings and not as another array or dictionary?

pickwick · Accepted Answer · 2014-06-18 20:55:00Z

0

I can't tell exactly what your input string is, but you can use NSString's componentsSeparatedByString function to split up a string into an array of substrings.

answered Jun 18, 2014 at 20:55

pickwick

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1 Comment

zaph Over a year ago

Not what you want to do when you have NSJSONSerialization.

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