From Test-Scratch-Wiki

This article or section documents an outdated version of Scratch (version 1.4). For this article in Scratch 2.0, see Eng:Casting (2.0).

Casting is the conversion of data types for compatibility within methods. For example, a list is cast to a string whenever it is used as a string input. So joining a list [a, b, c] to "... is a list" will return the string "a b c ... is a list".

Rules

Casting in Scratch follows the following rules:

Casting Rules String input Number input
Strings String:
"abc"
"abc" 0
String:
"123"
"123" 123
Numbers Number:
123
"123" 123
Booleans Boolean:
true
"true". You cannot insert booleans in number inserters, but as per some modifications of Scratch, 1. Most modifications, however, cast to 0.
Boolean:
false
The string "false". You cannot insert booleans in number inserters, but as per some modifications of Scratch, 0.
Lists List:
["a", "b", "c"]
"abc" 0
List:
["a", "b", "c", "are the letters"]
"a b c are the letters" 0
List:
[1, 2, 3]
"123" 123
List:
[1, 22, 3]
"1 22 3" 1
List:
[3, ".", 1, 4]
"3.14" 3.14
List:
[]
"" 0
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