$identity $identity : callable Identity function: returns the only argument. Type callable — {(x) ==> x}
$key $key : callable Key function: returns the second argument of two. Type callable — {(v, k) ==> k}
$value $value : callable Value function: returns the first argument of two. Type callable — {(v, k) ==> v}
$compareStrict $compareStrict : callable Compare strict function: returns -1, 0 or 1 based on === and > operators. Type callable
$compareStrictReversed $compareStrictReversed : callable Compare strict function reversed: returns 1, 0 or -1 based on === and > operators. Type callable
$compareLoose $compareLoose : callable Compare loose function: returns -1, 0 or 1 based on == and > operators. Type callable
$compareLooseReversed $compareLooseReversed : callable Compare loose function reversed: returns 1, 0 or -1 based on == and > operators. Type callable
$compareInt $compareInt : callable Compare int function: returns the difference between the first and the second argument. Type callable
$compareIntReversed $compareIntReversed : callable Compare int function reversed: returns the difference between the second and the first argument. Type callable
increment() increment() : callable Increment function: returns incremental integers starting from 0. Returns callable