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41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
package arrays
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import (
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"context"
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"github.com/MontFerret/ferret/pkg/runtime/core"
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"github.com/MontFerret/ferret/pkg/runtime/values"
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"github.com/MontFerret/ferret/pkg/runtime/values/types"
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)
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// Nth returns the element of an array at a given position.
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// It is the same as anyArray[position] for positive positions, but does not support negative positions.
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// @param array (Array) - An array with elements of arbitrary type.
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// @param index (Int) - Position of desired element in array, positions start at 0.
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// @returns (Read) - The array element at the given position.
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// If position is negative or beyond the upper bound of the array, then NONE will be returned.
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func Nth(_ context.Context, args ...core.Value) (core.Value, error) {
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err := core.ValidateArgs(args, 2, 2)
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if err != nil {
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return values.None, err
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}
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err = core.ValidateType(args[0], types.Array)
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if err != nil {
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return values.None, err
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}
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err = core.ValidateType(args[1], types.Int)
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if err != nil {
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return values.None, err
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}
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arr := args[0].(*values.Array)
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idx := args[1].(values.Int)
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return arr.Get(idx), nil
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}
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