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type Predicate = fn(int) - bool;
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Starting with the very basic, 3 + 4 = 7. The data is 3 and 4. The operation is +.，详情可参考新收录的资料
For simplicity, I'm using the "throw as return" pattern here, which is an anti-pattern. The error-as-value discussion is out-of-scope for this post. I just wanted to highlight that I'm aware that the design here is lacking and that we're making a shortcut.