14- Combining Predicates

Jul 01, 2026 03:47 · 2:10 · English · Whisper Turbo · 2 Cynhadledd

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So we talked about composing functions to build more complex and interesting

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functions We can also combine predicates to build more complex

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predicates.

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Let me show you so I'm going to declare two predicates a

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predicate of a string called has left brace so

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str goes to str

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that starts with a left brace That's a

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small reusable predicate

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call the second predicate has right brace and

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here we call the ends with method and pass

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a right brace Now we can combine this predicates.

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Let me show you.

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So if you type has left brace dot look we

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have and negate and or these are

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equivalent to The logical and the logical or and

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the not operator in Java.

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So let's say has left brace

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And here we should pass a second predicate.

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So we pass has right brace.

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Now this returns a new predicate.

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We can store it over here and call it has

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left and right braces.

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And then just like any

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other predicates,

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we can use that to test an object.

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So we call a test method and pass a string like this.

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Key colon value.

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this returns the result.

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In this case the result is true because this string has both the left

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and right braces.

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Now we can also combine two predicates using a

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logical OR.

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So in this case we get a new predicate and this

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returns true if our input string has either the left or the right brace.

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Now,

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what about the negate method?

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That is pretty straightforward.

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So we call the negate method and this returns a new predicate

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that does the opposite of

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the first predicate.

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So this is how we can combine predicates.

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