'的' usage

What is the purpose of '的' in this sentence: '我買了一些吃的'.

It doesn't appear to me to fit any of the uses or structures containing '的' that I've read about.

submitted by /u/Napoder
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from r/ChineseLanguage: a community for people who are studying, teaching, or interested in Chinese! https://www.reddit.com/r/ChineseLanguage/comments/9q8aun/的_usage/

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