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|
ns: math
preamble: |
A set of basic math functions to be able to perform simple arithmetic operations with `gomplate`.
### Supported input
In general, any input will be converted to the correct input type by the various functions in this package, and an appropriately-typed value will be returned type. Special cases are documented.
In addition to regular base-10 numbers, integers can be
[specified](https://golang.org/ref/spec#Integer_literals) as octal (prefix with
`0`) or hexadecimal (prefix with `0x`).
Decimal/floating-point numbers can be [specified](https://golang.org/ref/spec#Floating-point_literals)
with optional exponents.
Some examples demonstrating this:
```console
$ NUM=50 gomplate -i '{{ div (getenv "NUM") 10 }}'
5
$ gomplate -i '{{ add "0x2" "02" "2.0" "2e0" }}'
8
$ gomplate -i '{{ add 2.5 2.5 }}'
5.0
```
funcs:
- name: math.Abs
released: v2.6.0
description: |
Returns the absolute value of a given number. When the input is an integer, the result will be an `int64`, otherwise it will be a `float64`.
arguments:
- name: num
required: true
description: The input number
examples:
- |
$ gomplate -i '{{ math.Abs -3.5 }} {{ math.Abs 3.5 }} {{ math.Abs -42 }}'
3.5 3.5 42
- name: math.Add
alias: add
released: v2.2.0
description: |
Adds all given operators. When one of the inputs is a floating-point number, the result will be a `float64`, otherwise it will be an `int64`.
arguments:
- name: n...
required: true
description: The numbers to add together
examples:
- |
$ gomplate -i '{{ math.Add 1 2 3 4 }} {{ math.Add 1.5 2 3 }}'
10 6.5
- name: math.Ceil
released: v2.6.0
description: |
Returns the least integer value greater than or equal to a given floating-point number. This wraps Go's [`math.Ceil`](https://pkg.go.dev/math/#Ceil).
**Note:** the return value of this function is a `float64` so that the special-cases `NaN` and `Inf` can be returned appropriately.
arguments:
- name: num
required: true
description: The input number. Will be converted to a `float64`, or `0` if not convertible
examples:
- |
$ gomplate -i '{{ range (coll.Slice 5.1 42 "3.14" "0xFF" "NaN" "Inf" "-0") }}ceil {{ printf "%#v" . }} = {{ math.Ceil . }}{{"\n"}}{{ end }}'
ceil 5.1 = 6
ceil 42 = 42
ceil "3.14" = 4
ceil "0xFF" = 255
ceil "NaN" = NaN
ceil "Inf" = +Inf
ceil "-0" = 0
- name: math.Div
alias: div
released: v2.2.0
description: |
Divide the first number by the second. Division by zero is disallowed. The result will be a `float64`.
pipeline: true
arguments:
- name: a
required: true
description: The divisor
- name: b
required: true
description: The dividend
examples:
- |
$ gomplate -i '{{ math.Div 8 2 }} {{ math.Div 3 2 }}'
4 1.5
- name: math.Floor
released: v2.6.0
description: |
Returns the greatest integer value less than or equal to a given floating-point number. This wraps Go's [`math.Floor`](https://pkg.go.dev/math/#Floor).
**Note:** the return value of this function is a `float64` so that the special-cases `NaN` and `Inf` can be returned appropriately.
arguments:
- name: num
required: true
description: The input number. Will be converted to a `float64`, or `0` if not convertible
examples:
- |
$ gomplate -i '{{ range (coll.Slice 5.1 42 "3.14" "0xFF" "NaN" "Inf" "-0") }}floor {{ printf "%#v" . }} = {{ math.Floor . }}{{"\n"}}{{ end }}'
floor 5.1 = 4
floor 42 = 42
floor "3.14" = 3
floor "0xFF" = 255
floor "NaN" = NaN
floor "Inf" = +Inf
floor "-0" = 0
- name: math.IsFloat
released: v2.6.0
description: |
Returns whether or not the given number can be interpreted as a floating-point literal, as defined by the [Go language reference](https://golang.org/ref/spec#Floating-point_literals).
**Note:** If a decimal point is part of the input number, it will be considered a floating-point number, even if the decimal is `0`.
arguments:
- name: num
required: true
description: The value to test
examples:
- |
$ gomplate -i '{{ range (coll.Slice 1.0 "-1.0" 5.1 42 "3.14" "foo" "0xFF" "NaN" "Inf" "-0") }}{{ if (math.IsFloat .) }}{{.}} is a float{{"\n"}}{{ end }}{{end}}'
1 is a float
-1.0 is a float
5.1 is a float
3.14 is a float
NaN is a float
Inf is a float
- name: math.IsInt
released: v2.6.0
description: |
Returns whether or not the given number is an integer.
arguments:
- name: num
required: true
description: The value to test
examples:
- |
$ gomplate -i '{{ range (coll.Slice 1.0 "-1.0" 5.1 42 "3.14" "foo" "0xFF" "NaN" "Inf" "-0") }}{{ if (math.IsInt .) }}{{.}} is an integer{{"\n"}}{{ end }}{{end}}'
42 is an integer
0xFF is an integer
-0 is an integer
- name: math.IsNum
released: v2.6.0
description: |
Returns whether the given input is a number. Useful for `if` conditions.
arguments:
- name: in
required: true
description: The value to test
examples:
- |
$ gomplate -i '{{ math.IsNum "foo" }} {{ math.IsNum 0xDeadBeef }}'
false true
- name: math.Max
released: v2.6.0
description: |
Returns the largest number provided. If any values are floating-point numbers, a `float64` is returned, otherwise an `int64` is returned. The same special-cases as Go's [`math.Max`](https://pkg.go.dev/math/#Max) are followed.
arguments:
- name: nums...
required: true
description: One or more numbers to compare
examples:
- |
$ gomplate -i '{{ math.Max 0 8.0 4.5 "-1.5e-11" }}'
8
- name: math.Min
released: v2.6.0
description: |
Returns the smallest number provided. If any values are floating-point numbers, a `float64` is returned, otherwise an `int64` is returned. The same special-cases as Go's [`math.Min`](https://pkg.go.dev/math/#Min) are followed.
arguments:
- name: nums...
required: true
description: One or more numbers to compare
examples:
- |
$ gomplate -i '{{ math.Min 0 8 4.5 "-1.5e-11" }}'
-1.5e-11
- name: math.Mul
alias: mul
released: v2.2.0
description: |
Multiply all given operators together.
arguments:
- name: n...
required: true
description: The numbers to multiply
examples:
- |
$ gomplate -i '{{ math.Mul 8 8 2 }}'
128
- name: math.Pow
alias: pow
released: v2.2.0
description: |
Calculate an exponent - _b<sup>n</sup>_. This wraps Go's [`math.Pow`](https://pkg.go.dev/math/#Pow). If any values are floating-point numbers, a `float64` is returned, otherwise an `int64` is returned.
arguments:
- name: b
required: true
description: The base
- name: 'n'
required: true
description: The exponent
examples:
- |
$ gomplate -i '{{ math.Pow 10 2 }}'
100
$ gomplate -i '{{ math.Pow 2 32 }}'
4294967296
$ gomplate -i '{{ math.Pow 1.5 2 }}'
2.2
- name: math.Rem
alias: rem
released: v2.2.0
description: |
Return the remainder from an integer division operation.
pipeline: true
arguments:
- name: a
required: true
description: The divisor
- name: b
required: true
description: The dividend
examples:
- |
$ gomplate -i '{{ math.Rem 5 3 }}'
2
$ gomplate -i '{{ math.Rem -5 3 }}'
-2
- name: math.Round
released: v2.6.0
description: |
Returns the nearest integer, rounding half away from zero.
**Note:** the return value of this function is a `float64` so that the special-cases `NaN` and `Inf` can be returned appropriately.
arguments:
- name: num
required: true
description: The input number. Will be converted to a `float64`, or `0` if not convertible
examples:
- |
$ gomplate -i '{{ range (coll.Slice -6.5 5.1 42.9 "3.5" 6.5) }}round {{ printf "%#v" . }} = {{ math.Round . }}{{"\n"}}{{ end }}'
round -6.5 = -7
round 5.1 = 5
round 42.9 = 43
round "3.5" = 4
round 6.5 = 7
- name: math.Seq
alias: seq
released: v2.2.0
description: |
Return a sequence from `start` to `end`, in steps of `step`. Can handle counting
down as well as up, including with negative numbers.
Note that the sequence _may_ not end at `end`, if `end` is not divisible by `step`.
arguments:
- name: start
required: false
description: The first number in the sequence (defaults to `1`)
- name: end
required: true
description: The last number in the sequence
- name: step
required: false
description: The amount to increment between each number (defaults to `1`)
examples:
- |
$ gomplate -i '{{ range (math.Seq 5) }}{{.}} {{end}}'
1 2 3 4 5
- |
$ gomplate -i '{{ conv.Join (math.Seq 10 -3 2) ", " }}'
10, 8, 6, 4, 2, 0, -2
- name: math.Sub
alias: sub
released: v2.2.0
description: |
Subtract the second from the first of the given operators. When one of the inputs is a floating-point number, the result will be a `float64`, otherwise it will be an `int64`.
pipeline: true
arguments:
- name: a
required: true
description: The minuend (the number to subtract from)
- name: b
required: true
description: The subtrahend (the number being subtracted)
examples:
- |
$ gomplate -i '{{ math.Sub 3 1 }}'
2
|
