Question 127804 in Android Studio Question posted in
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Android Studio – How to remove first char in kotlin string

I’m trying to make a calculator in Android Studio with Kotlin and I trying to allow users to make numbers negative and positive, but I got only half of it, making number negative, but can’t make it so it turns back to positive, for it I need to remove first char in string, someone knows how to do it?

var firstNumber: String = ...
if (firstNumber[0] == '-') {
   firstNumber.
}
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2

Answers


  1. 0

    You could use substring:

    firstNumber = firstNumber.substring(1);
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  2. 0

    You can use drop() of String class to remove first char of string.

    firstName = firstName.drop(1);
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