len

Outputs the length of an array

Description

This will read an array from STDIN and outputs the length for that array

Usage

`<stdin>` -> len -> `<stdout>`

Examples

» tout: json (["a", "b", "c"]) -> len
3

Detail

Please note that this returns the length of the array rather than string. For example out "foobar" -> len would return 1 because an array in the str data type would be new line separated (eg out "foo\nbar" -> len would return 2). If you need to count characters in a string and are running POSIX (eg Linux / BSD / OSX) then it is recommended to use wc instead. But be mindful that wc will also count new line characters

» out: "foobar" -> len
1

» out: "foo\nbar" -> len
2

» out: "foobar" -> wc: -c
7

» out: "foo\nbar" -> wc: -c
8

» printf: "foobar" -> wc: -c
6
# (printf does not print a trailing new line)

See Also

• commands/@[ (range) : Outputs a ranged subset of data from STDIN
• commands/[[ (element): Outputs an element from a nested structure
• commands/[ (index): Outputs an element from an array, map or table
• commands/a (mkarray): A sophisticated yet simple way to build an array or list
• commands/append: Add data to the end of an array
• commands/ja (mkarray): A sophisticated yet simply way to build a JSON array
• commands/jsplit: Splits STDIN into a JSON array based on a regex parameter
• commands/map: Creates a map from two data sources
• commands/msort: Sorts an array - data type agnostic
• commands/mtac: Reverse the order of an array
• commands/prepend: Add data to the start of an array