let for core

Create a variable and give it a value.

Signature

> let {flags} (var_name) (initial_value)

Parameters

  • var_name: The variable name to create.
  • initial_value: Equals sign followed by value.

Input/output types:

inputoutput
anyany

Examples

Set a variable to a value (no output).

> let x = 10

Set a variable to the result of an expression (no output).

> let x = 10 + 100

Set a variable based on the condition (no output).

> let x = if false { -1 } else { 1 }

Set a variable to the output of a pipeline.

> ls | let files

Use let in the middle of a pipeline to assign and pass the value.

> 10 | let x | $x + 5
15

Use let in the middle of a pipeline, then consume value with $in.

> 10 | let x | $in + 5
15

Notes

This command is a parser keyword. For details, check: https://www.nushell.sh/book/thinking_in_nu.html