Get the number of a character in a string

Split on a character and count the pieces.

JavaScript Version 1.0.0 · MIT · .md

function characterCount({ text, char }) { return text.split(char).length - 1; }

Input & expected output

{
  "text": "[email protected]",
  "char": "."
}

1

The edge case

{
  "text": "",
  "char": "a"
}

0

Know the limits

• char is a single character; longer strings count non-overlapping occurrences.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Capitalize a string — Uppercase the first Unicode code point and preserve the remaining text.
• Reverse a string — Reverse Unicode code points without splitting surrogate pairs.
• Check a palindrome — Compare a string with its code-point reversal.