Sets - language feature

Example from JavaScript, TypeScript:

set = new Set()
set.add("foo")

Example from YAML, YAMP:

# Explicitly typed set.
baseball players: !!set
  ? Mark McGwire
  ? Sammy Sosa
  ? Ken Griffey
# Flow style
baseball teams: !!set { Boston Red Sox, Detroit Tigers, New York Yankees }

Languages with Sets include JavaScript, TypeScript, YAML, EDN, YAMP

Languages without Sets include Bash

This question asks: Does the language come with a Set data structure?