133 lines
3.8 KiB
Markdown
133 lines
3.8 KiB
Markdown
---
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title: bitwise.ulshift() function
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description: >
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`bitwise.ulshift()` shifts the bits in `a` left by `b` bits.
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Both `a` and `b` are unsigned integers.
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menu:
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flux_v0_ref:
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name: bitwise.ulshift
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parent: bitwise
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identifier: bitwise/ulshift
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weight: 101
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---
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<!------------------------------------------------------------------------------
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IMPORTANT: This page was generated from comments in the Flux source code. Any
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edits made directly to this page will be overwritten the next time the
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documentation is generated.
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To make updates to this documentation, update the function comments above the
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function definition in the Flux source code:
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https://github.com/influxdata/flux/blob/master/stdlib/bitwise/bitwise.flux#L175-L175
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Contributing to Flux: https://github.com/influxdata/flux#contributing
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Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md
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------------------------------------------------------------------------------->
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`bitwise.ulshift()` shifts the bits in `a` left by `b` bits.
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Both `a` and `b` are unsigned integers.
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##### Function type signature
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```js
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(a: uint, b: uint) => uint
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```
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{{% caption %}}
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For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
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{{% /caption %}}
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## Parameters
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### a
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({{< req >}})
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Left hand operand.
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### b
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({{< req >}})
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Number of bits to shift.
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## Examples
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- [Shift bits left in an unsigned integer](#shift-bits-left-in-an-unsigned-integer)
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- [Shift bits left in unsigned integers in a stream of tables](#shift-bits-left-in-unsigned-integers-in-a-stream-of-tables)
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### Shift bits left in an unsigned integer
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```js
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import "bitwise"
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bitwise.ulshift(a: uint(v: 1234), b: uint(v: 2))// Returns 4936 (uint)
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```
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### Shift bits left in unsigned integers in a stream of tables
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```js
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import "bitwise"
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import "sampledata"
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sampledata.uint()
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|> map(fn: (r) => ({r with _value: bitwise.ulshift(a: r._value, b: uint(v: 3))}))
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```
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{{< expand-wrapper >}}
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{{% expand "View example input and output" %}}
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#### Input data
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| _time | _value | *tag |
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| -------------------- | -------------------- | ---- |
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| 2021-01-01T00:00:00Z | 18446744073709551614 | t1 |
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| 2021-01-01T00:00:10Z | 10 | t1 |
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| 2021-01-01T00:00:20Z | 7 | t1 |
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| 2021-01-01T00:00:30Z | 17 | t1 |
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| 2021-01-01T00:00:40Z | 15 | t1 |
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| 2021-01-01T00:00:50Z | 4 | t1 |
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| _time | _value | *tag |
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| -------------------- | -------------------- | ---- |
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| 2021-01-01T00:00:00Z | 19 | t2 |
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| 2021-01-01T00:00:10Z | 4 | t2 |
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| 2021-01-01T00:00:20Z | 18446744073709551613 | t2 |
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| 2021-01-01T00:00:30Z | 19 | t2 |
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| 2021-01-01T00:00:40Z | 13 | t2 |
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| 2021-01-01T00:00:50Z | 1 | t2 |
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#### Output data
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| _time | _value | *tag |
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| -------------------- | -------------------- | ---- |
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| 2021-01-01T00:00:00Z | 18446744073709551600 | t1 |
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| 2021-01-01T00:00:10Z | 80 | t1 |
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| 2021-01-01T00:00:20Z | 56 | t1 |
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| 2021-01-01T00:00:30Z | 136 | t1 |
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| 2021-01-01T00:00:40Z | 120 | t1 |
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| 2021-01-01T00:00:50Z | 32 | t1 |
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| _time | _value | *tag |
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| -------------------- | -------------------- | ---- |
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| 2021-01-01T00:00:00Z | 152 | t2 |
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| 2021-01-01T00:00:10Z | 32 | t2 |
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| 2021-01-01T00:00:20Z | 18446744073709551592 | t2 |
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| 2021-01-01T00:00:30Z | 152 | t2 |
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| 2021-01-01T00:00:40Z | 104 | t2 |
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| 2021-01-01T00:00:50Z | 8 | t2 |
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{{% /expand %}}
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{{< /expand-wrapper >}}
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