22 lines
440 B
Go
22 lines
440 B
Go
package builtins
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import (
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"monkey/internal/object"
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"monkey/internal/typing"
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)
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// Len ...
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func Len(args ...object.Object) object.Object {
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if err := typing.Check(
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"len", args,
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typing.ExactArgs(1),
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); err != nil {
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return newError(err.Error())
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}
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if size, ok := args[0].(object.Sizeable); ok {
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return &object.Integer{Value: int64(size.Len())}
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}
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return newError("TypeError: object of type '%s' has no len()", args[0].Type())
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}
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