Documentation

Work with functions

A function type is a set of parameters that perform an operation.

Function syntax

A Flux function literal contains the following:

  • Zero or more parameters enclosed in parentheses (())
    • Parameters are comma separated
    • Parameters must be named (no positional params)
    • Optionally assign a default value for each parameter with the = assignment operator. Parameters without a default value require user input and are considered required parameters.
  • => arrow operator to pass parameters into the function body.
  • Function body to define function operations and return a response.
Example functions
// Function that returns the value 1
() => 1

// Function that returns the sum of a and b
(a, b) => a + b

// Function with default values
(x=1, y=1) => x * y

// Function with a block body
(a, b, c) => { 
    d = a + b
    return d / c
}

Define functions

For information about defining custom functions, see Define custom functions.


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The future of Flux

Flux is going into maintenance mode. You can continue using it as you currently are without any changes to your code.

Flux is going into maintenance mode and will not be supported in InfluxDB 3.0. This was a decision based on the broad demand for SQL and the continued growth and adoption of InfluxQL. We are continuing to support Flux for users in 1.x and 2.x so you can continue using it with no changes to your code. If you are interested in transitioning to InfluxDB 3.0 and want to future-proof your code, we suggest using InfluxQL.

For information about the future of Flux, see the following: