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1-js/99-js-misc/01-proxy/01-error-nonexisting/task.md
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# Error on reading non-existant property
# Error on reading non-existent property
Usually, an attempt to read a non-existant property returns `undefined`.
Usually, an attempt to read a non-existent property returns `undefined`.
Create a proxy that throws an error for an attempt to read of a non-existant property instead.
Create a proxy that throws an error for an attempt to read of a non-existent property instead.
That can help to detect programming mistakes early.