Kotlin – Delete Character at Index in String

Delete character at specific index in String in Kotlin

To delete character at specific index in a given string in Kotlin, you can use String.substirng() function.

Find the substring from starting of the string till the position before the given index. This is our first part.

str.substring(0, index)

Then find the substring from after the index till the end of the string. This is our second part. 

str.substring(index+1)

Join these two parts to create a string from the original string with the character deleted at the specified index.

str.substring(0, index) + str.substring(index+1)

Examples

Delete character at index=4

In the following program, we take a string in str and delete the character at index=4.

Kotlin Program

fun main() {
    val str = "abcdefghijk"
    val index = 4
    val resultString = str.substring(0, index) + str.substring(index+1)
    println(resultString)
}

Output

abcdfghijk

Explanation

a  b  c  d  f  g  h  i  j  k  <- str
0  1  2  3  4  5  6  7  8  9  <- indices
            4  <- index (delete character)
a  b  c  d     g  h  i  j  k
0        3     5           9
str(0, 4)   +  str(5)