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arrays.go
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/
arrays.go
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//go:build js
package jshelpers
import (
"fmt"
"reflect"
"syscall/js"
)
var (
jsArray = js.Global().Get("Array")
)
func asSlice(typ reflect.Type, value js.Value) (any, error) {
if !value.InstanceOf(jsArray) {
return nil, fmt.Errorf("value type should be Array")
}
l := value.Length()
slice := reflect.MakeSlice(reflect.SliceOf(typ), l, l)
for i := 0; i < l; i++ {
val, err := goValue(typ, value.Index(i))
if err != nil {
return nil, fmt.Errorf("slice item is invalid: %w", err)
}
slice.Index(i).Set(reflect.ValueOf(val))
}
return slice.Interface(), nil
}
// AsSlice converts a JS value to a slice of T
// value must be an array of a type handled by goValue
func AsSlice[T any](value js.Value) ([]T, error) {
var t T
slice, err := asSlice(reflect.TypeOf(t), value)
if err != nil {
return nil, err
}
return slice.([]T), nil
}
// FromSlice converts a Go slice to a JS Array
func FromSlice(from any) js.Value {
fromValue := reflect.ValueOf(from)
arrayItems := make([]any, fromValue.Len())
for i := 0; i < len(arrayItems); i++ {
arrayItems[i] = jsValue(fromValue.Index(i).Interface())
}
return jsArray.New(arrayItems...)
}