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With a NSMutableString, how would I insert a "-" sign at the index "0" for an NSMutableString called "a". Right now my code looks like this:

a = [insertString: @"-" atIndex: 0];

Xcode throws an error saying that 'insertString' is undeclared. Something looks very wrong with my code. Please give me guidance.

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  • To expand on what @jop said, its [receiver message (possibly arguments here, arguments are indicated by a : colon)]. In this case, the correct format is [a /*receiver*/ insertString: /*message*/ @"-" atIndex: 0 */arguments*/] Commented Oct 12, 2013 at 14:05

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put the object inside the brackets:

[a insertString: @"-" atIndex: 0];
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