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5 changed files with 71 additions and 6 deletions
44
docs/content/en/functions/math/Rand.md
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44
docs/content/en/functions/math/Rand.md
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@ -0,0 +1,44 @@
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---
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title: math.Rand
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description: Returns a pseudo-random number in the half-open interval [0.0, 1.0).
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categories: []
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keywords: []
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action:
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aliases: []
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related: []
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returnType: float64
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signatures: [math.Rand]
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---
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The `math.Rand` function returns a pseudo-random number in the [half-open interval] [0.0, 1.0).
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```go-html-template
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{{ math.Rand }} → 0.6312770459590062
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```
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To generate a random integer in the [closed interval] [0, 5]:
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```go-html-template
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{{ math.Rand | mul 6 | math.Floor }}
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```
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To generate a random integer in the closed interval [1, 6]:
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```go-html-template
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{{ math.Rand | mul 6 | math.Ceil }}
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```
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To generate a random float, with one digit after the decimal point, in the closed interval [0, 4.9]:
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```go-html-template
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{{ div (math.Rand | mul 50 | math.Floor) 10 }}
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```
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To generate a random float, with one digit after the decimal point, in the closed interval [0.1, 5.0]:
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```go-html-template
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{{ div (math.Rand | mul 50 | math.Ceil) 10 }}
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```
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[closed interval]: /getting-started/glossary/#interval
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[half-open interval]: /getting-started/glossary/#interval
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@ -147,6 +147,16 @@ A numeric data type without a fractional component. For example, `42`.
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Software design and development efforts that enable [localization](#localization). See the [W3C definition](https://www.w3.org/International/questions/qa-i18n). Abbreviated i18n.
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###### interval
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An [interval](https://en.wikipedia.org/wiki/Interval_(mathematics)) is a range of numbers between two endpoints: closed, open, or half-open.
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- A _closed_ interval, denoted by brackets, includes its endpoints. For example, [0, 1] is the interval where `0 <= x <= 1`.
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- An _open_ interval, denoted by parenthesis, excludes its endpoints. For example, (0, 1) is the interval where `0 < x < 1`.
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- A _half-open_ interval includes only one of its endpoints. For example, (0, 1] is the _left-open_ interval where `0 < x <= 1`, while [0, 1) is the _right-open_ interval where `0 <= x < 1`.
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###### kind
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See [page kind](#page-kind).
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@ -115,6 +115,13 @@ func init() {
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},
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)
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ns.AddMethodMapping(ctx.Rand,
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nil,
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[][2]string{
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{"{{ math.Rand }}", "0.6312770459590062"},
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},
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)
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ns.AddMethodMapping(ctx.Round,
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nil,
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[][2]string{
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@ -18,6 +18,7 @@ import (
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"errors"
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"fmt"
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"math"
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"math/rand"
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"reflect"
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"sync/atomic"
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@ -157,6 +158,11 @@ func (ns *Namespace) Pow(n1, n2 any) (float64, error) {
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return math.Pow(af, bf), nil
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}
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// Rand returns, as a float64, a pseudo-random number in the half-open interval [0.0,1.0).
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func (ns *Namespace) Rand() float64 {
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return rand.Float64()
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}
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// Round returns the integer nearest to n, rounding half away from zero.
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func (ns *Namespace) Round(n any) (float64, error) {
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xf, err := cast.ToFloat64E(n)
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@ -61,12 +61,10 @@ title: "**BatMan**"
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ns := nsf(d)
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for _, mm := range ns.MethodMappings {
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for _, example := range mm.Examples {
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if strings.Contains(example[0], "errorf") {
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// This will fail the build, so skip for now.
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continue
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}
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if strings.Contains(example[0], "transform.XMLEscape") {
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// This will fail the build, so skip for now.
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// These will fail the build, so skip.
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if strings.Contains(example[0], "errorf") ||
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strings.Contains(example[0], "transform.XMLEscape") ||
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strings.Contains(example[0], "math.Rand") {
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continue
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}
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templates = append(templates, example[0])
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