strings.isLetter() function

The strings.isLetter() function tests if a single character string is a letter (a-z, A-Z).

*Output data type: Boolean*

import "strings"
strings.isLetter(v: "A")
// returns true

Parameters

v

The single character string to test.

*Data type: String*

Examples

Filter by columns with single-letter values

import "strings"
data
  |> filter(fn: (r) => strings.isLetter(v: r.serverRef))

Related articles

• strings.isDigit() function