26 lines
575 B
Go
26 lines
575 B
Go
package builtins
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import "monkey/object"
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// Rest ...
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func Rest(args ...object.Object) object.Object {
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if len(args) != 1 {
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return newError("wrong number of arguments. got=%d, want=1",
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len(args))
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}
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if args[0].Type() != object.ARRAY_OBJ {
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return newError("argument to `rest` must be array, got %s",
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args[0].Type())
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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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newElements := make([]object.Object, length-1, length-1)
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copy(newElements, arr.Elements[1:length])
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return &object.Array{Elements: newElements}
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}
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return nil
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}
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