1
0
mirror of https://github.com/MontFerret/ferret.git synced 2024-12-16 11:37:36 +02:00
ferret/pkg/stdlib/math/average.go
Tim Voronov 1af8b37a0f
New type system (#232)
* New type system

* Fixed dot notation for HTML elements
2019-02-13 12:31:18 -05:00

56 lines
1.0 KiB
Go

package math
import (
"context"
"github.com/MontFerret/ferret/pkg/runtime/core"
"github.com/MontFerret/ferret/pkg/runtime/values"
"github.com/MontFerret/ferret/pkg/runtime/values/types"
)
// Average Returns the average (arithmetic mean) of the values in array.
// @param array (Array) - Array of numbers.
// @returns (Float) - The average of the values in array.
func Average(_ context.Context, args ...core.Value) (core.Value, error) {
var err error
err = core.ValidateArgs(args, 1, 1)
if err != nil {
return values.None, err
}
err = core.ValidateType(args[0], types.Array)
if err != nil {
return values.None, err
}
arr := args[0].(*values.Array)
if arr.Length() == 0 {
return values.None, nil
}
var sum float64
arr.ForEach(func(value core.Value, idx int) bool {
err = core.ValidateType(value, types.Float, types.Int)
if err != nil {
return false
}
sum += toFloat(value)
return true
})
if err != nil {
return values.None, nil
}
count := arr.Length()
return values.Float(sum / float64(count)), nil
}