ferret/pkg/stdlib/arrays/remove_value.go

package arrays

import (
	"context"

	"github.com/MontFerret/ferret/pkg/runtime/core"
	"github.com/MontFerret/ferret/pkg/runtime/values"
	"github.com/MontFerret/ferret/pkg/runtime/values/types"
)

// RemoveValue returns a new array with removed all occurrences of value in a given array.
// Optionally with a limit to the number of removals.
// @param array (Array) - Source array.
// @param value (Read) - Target value.
// @param limit (Int, optional) - A limit to the number of removals.
// @returns (Array) - A new array with removed all occurrences of value in a given array.
func RemoveValue(_ context.Context, args ...core.Value) (core.Value, error) {
	err := core.ValidateArgs(args, 2, 3)

	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)
	value := args[1]
	limit := -1

	if len(args) > 2 {
		err = core.ValidateType(args[2], types.Int)

		if err != nil {
			return values.None, err
		}

		limit = int(args[2].(values.Int))
	}

	result := values.NewArray(int(arr.Length()))

	counter := 0
	arr.ForEach(func(item core.Value, idx int) bool {
		remove := item.Compare(value) == 0

		if remove {
			if counter == limit {
				result.Push(item)
			}

			counter++
		} else {
			result.Push(item)
		}

		return true
	})

	return result, nil
}