26 lines
503 B
Go
26 lines
503 B
Go
package object
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// Pop ...
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func Pop(args ...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() != ARRAY_OBJ {
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return newError("argument to `pop` must be ARRAY, got %s",
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args[0].Type())
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}
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arr := args[0].(*Array)
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length := len(arr.Elements)
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if length == 0 {
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return newError("cannot 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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