Length#

Array-like objects have a defined concept of length.

Definition of Length#

The definition of length varies by value type.

Length is defined as some numeric value, but is not necessarily an integer.

Length Operator $#array#

The length operator $#array gets the length of a value.

$ xa '$#"123"'
# 3

$ xa '$#[1, 2, 3]'
# 3

$ xa '$#{a: 1; b: 2; c: 3}'
# 3

$ xa '$#BLOB.of([1, 2, 3])'
# 3

$ xa '$#("abc", "def", "ghi")'
# 9

Overriding the Length Operator#

Length retrieval is performed by calling the $#_ method on the value.

You can change the behavior of length retrieval by overriding the $#_ method.

$ xa '
  Object := {
    `$#_`: this -> this.length
  }
  object := Object{length: 123}
  $#object
'
# 123

Length can be a decimal value.

$ xa '
  Line := {
    `$#_`: this -> ((this.b.0 - this.a.0) ^ 2 + (this.b.1 - this.a.1) ^ 2) ^ 0.5
  }
  object := Line{
    a: [1, 2]
    b: [2, 3]
  }
  "$%.4f($#object)"
'
# 1.4142