20 lines
451 B
Go
20 lines
451 B
Go
package objects
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import (
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"fmt"
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)
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func builtinLen(args ...Object) (Object, error) {
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if len(args) != 1 {
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return nil, fmt.Errorf("wrong number of arguments (got=%d, want=1)", len(args))
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}
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switch arg := args[0].(type) {
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case *Array:
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return &Int{Value: int64(len(arg.Value))}, nil
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case *String:
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return &Int{Value: int64(len(arg.Value))}, nil
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default:
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return nil, fmt.Errorf("unsupported type for 'len' function: %s", arg.TypeName())
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}
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}
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