31 lines
577 B
Go
31 lines
577 B
Go
package builtins
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import (
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"monkey/internal/context"
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"monkey/internal/object"
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"monkey/internal/typing"
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)
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// Pop ...
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func Pop(ctx context.Context, args ...object.Object) object.Object {
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if err := typing.Check(
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"pop", args,
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typing.ExactArgs(1),
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typing.WithTypes(object.ArrayType),
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); err != nil {
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return newError(err.Error())
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}
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arr := args[0].(*object.Array)
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length := len(arr.Elements)
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if length == 0 {
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return newError("IndexError: pop from an empty array")
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}
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element := arr.Elements[length-1]
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arr.Elements = arr.Elements[:length-1]
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return element
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}
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