Operators in the Flux language

Flux includes the following types of operators:

Also see:

Arithmetic operators

Arithmetic operators take two numerical values (either literals or variables) and perform a calculation that returns a single numerical value.

OperatorDescriptionExampleResult
`+`Addition`1 + 1``2`
`-`Subtraction`3 - 2``1`
`*`Multiplication`2 * 3``6`
`/`Division`9 / 3``3`
`^`Exponentiation`2 ^ 3``8`
`%`Modulo`10 % 5``0`

In the current version of Flux, values used in arithmetic operations must be of the same numeric type (integer or float). Operations with values of different numeric types will result in a type error.

Comparison operators

Comparison operators compare expressions and return true or false based on the comparison.

OperatorDescriptionExampleResult
`==`Equal to`"abc" == "abc"``true`
`!=`Not equal to`"abc" != "def"``true`
`<`Less than`1 < 2``true`
`>`Greater than`1 > 2``false`
`<=`Less than or equal`1 <= 2``true`
`>=`Greater than or equal`1 >= 2``false`
`=~`Equal to regular expression`"abc" =~ /[a-z]*/``true`
`!~`Not equal to regular expression`"abc" !~ /[0-9]*/``true`

The `>` and `<` operators also compare the lexicographic order of strings.

Logical operators

OperatorDescription
`not`Returns `true` if right operand is `false`. Otherwise, returns `false`.
`exists`Returns `false` if right operand is null. Otherwise, returns `true`.
`and`Returns `true` if both operands are true. Otherwise, returns `false`.
`or`Returns `true` if any operand is true. Otherwise, returns `false`.

Short-circuit evaluation

Flux logical operators observe the short-circuiting behavior seen in other programming languages. The evaluation of the left-hand (LH) operand determines if the right-hand (RH) operand is evaluated.

• When the operator is `and` and the LH operand evaluates to `false`, the evaluation returns `false` without evaluating the RH operand.
• When the operator is `or` and the LH operand evaluates to `true`, the evaluation returns `true` without evaluating the RH operand.

Assignment operators

An assignment operator assigns a value to its left operand based on the value of its right operand.

OperatorDescriptionExampleMeaning
`=`Assign value of left expression to right expression`x = y`x = y

Function operators

Function operators facilitate the creation of functions and control the flow of data through operations.

OperatorDescriptionExamplesMeaning
`|>`Pipe‑forward`data |> function()`Tables contained in the “data” variable are piped into the function.
`<-`Pipe‑receive`tables=<-`The “tables” variable or parameter is assigned to data piped into the operation. This operator is used for any data type passed into a function; not just table data.
`=>`Arrow`(r) => r.tag1 == "tagvalue"`The arrow passes a record or parameters into function operations.
`()`Function call`top(n:10)`Call the `top` function setting the `n` parameter to `10` and perform the associated operations.

See Define custom functions for examples of function operators is use.

String Operators

String operators concatenate or compare string values.

OperatorDescriptionExamplesResult
`+`Concatenation`"ab" + "c"``"abc"`
`<`Less than in lexicographic order`"ant" < "bee"``true`
`>`Greater than in lexicographic order`"ant" > "bee"``false`

Literal constructors

Literal constructors define fixed values.

OperatorDescription
`[ ]`List / array
`{ }`Record
`""`String

Miscellaneous operators

OperatorDescriptionExample
`( )`Logical grouping`r._value / (r._value * 2)`
`,`Sequence delimiter`item1, item2, item3`
`:`Key-value separator`{name: "Bob"}`
`.`Member access / dot reference`r._measurement`

Operator precedence

The table below outlines operator precedence. Operators with a lower number have higher precedence.

PrecedenceOperatorDescription
1`a()`Function call
`a[]`Member or index access
`.`Member access
2`|>`Pipe forward
3`() => 1`FunctionLiteral
4`^`Exponentiation
5`*` `/` `%`Multiplication, division, and modulo
6`+` `-`Addition and subtraction
7`==` `!=`Comparison operators
`<` `<=`
`>` `>=`
`=~` `!~`
8`not`Unary logical operator
`exists`Null check operator
9`and`Logical AND
10`or`Logical OR
11`if` `then` `else`Conditional

Linux Package Signing Key Rotation

All signed InfluxData Linux packages have been resigned with an updated key. If using Linux, you may need to update your package configuration to continue to download and verify InfluxData software packages.

For more information, see the Linux Package Signing Key Rotation blog post.

InfluxDB Cloud backed by InfluxDB IOx

All InfluxDB Cloud organizations created on or after January 31, 2023 are backed by the new InfluxDB IOx storage engine. Check the right column of your InfluxDB Cloud organization homepage to see which InfluxDB storage engine you’re using.

InfluxDB Cloud backed by InfluxDB TSM

All InfluxDB Cloud organizations created on or after January 31, 2023 are backed by the new InfluxDB IOx storage engine which enables nearly unlimited series cardinality and SQL query support. Check the right column of your InfluxDB Cloud organization homepage to see which InfluxDB storage engine you’re using.