join

Written as join(argnum flags):options in a transform expression.

Minimum arguments	1
Maximum arguments	no limit
Default arguments	1
Argument modes	MULTIPLE_PRIMITIVES

Documentation

Join multiple string/bytes/convertible arguments with a separator.

Features:

• Joins any number of arguments (strings, bytes, or objects convertible to string)
• Supports skipping null/blank items with the ‘B’ flag
• Handles bytes objects by decoding them to UTF-8 strings
• Automatically converts non-string arguments using str()

Flags:

• ‘B’: Skip null/blank items (None or empty strings) during joining

Flags

Flag	Letter
spread_input	s
noncaptive_input	I
arg_num_flexible	f
skip_blank	B

Examples

Basic joining

Input args: ["Hello","World"]
Transforms: "join(2): "
Output: "Hello World"

Joining with skip blank flag

Input args: ["Hello",null,"World",""]
Transforms: "join(4B):,"
Output: "Hello,World"

Joining bytes

Input args: ["Hello","World"]
Transforms: "join(2): "
Output: "Hello World"

Mixed types

Input args: ["Count",1,2.5,true]
Transforms: "join(4):-"
Output: "Count-1-2.5-True"