Other functions

Tests whether the given optional value is defined, i.e., has a non-None value.

X?

optional value of any type.

returns

false if the input value is None, otherwise true.

String? name = "Alice"
String? missing = None

Boolean has_name = defined(name)
# `has_name` now contains `true`.

Boolean has_missing = defined(missing)
# `has_missing` now contains `false`.

if (defined(name)) {
  String greeting = "Hello, " + select_first([name])
  # This code will execute because `name` is defined.
}

Returns the length of the input argument as an Int: - For an Array[X] argument: the number of elements in the array. - For a Map[X, Y] argument: the number of items in the map. - For an Object argument: the number of key-value pairs in the object. - For a String argument: the number of characters in the string.

Array[X]|Map[X, Y]|Object|String

A collection or string whose elements are to be counted.

returns

The length of the collection/string as an Int.

Array[Int] xs = [1, 2, 3]
Map[String, Int] m = {"a": 1, "b": 2}
String s = "ABCDE"

Int xlen = length(xs)
# `xlen` now contains `3`.

Int mlen = length(m)
# `mlen` now contains `2`.

Int slen = length(s)
# `slen` now contains `5`.