Скачать или смотреть A More Concise Approach to Assert Arrays in Kotlin: allMatchPredicate and allCloseTo

Discover how to effectively assert that each element of an array matches a predicate in Kotlin using `allMatchPredicate` and `allCloseTo` for better code readability and simplicity.
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A More Concise Approach to Assert Arrays in Kotlin

When working with arrays in Kotlin, especially for numerical values like floating-point numbers, asserting their values can become tricky. You might be looking for ways to assert that an array's elements each match a specific predicate without writing verbose code. In this guide, we'll discuss a clean and efficient way to handle these assertions using the assertk library.

The Problem: Asserting Array Elements

In Kotlin, you typically want to check if the elements of an array satisfy certain conditions. For example, you might want to ensure all elements are greater than zero or are close to a specific set of expected values. Traditional assertion methods can lead to long and cumbersome blocks of code.

Example

Here's a brief look at how you might currently assert that each element in a DoubleArray is close to expected values, along with the accompanying solution:

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While this works for single values, it feels cumbersome when expanding it to arrays.

The Solution: Using allMatchPredicate and allCloseTo

To address this issue, we can extend the assertk library by creating two new methods: allMatchPredicate and allCloseTo. These methods allow for concise and clear assertions against DoubleArray.

Step 1: Creating allMatchPredicate

The allMatchPredicate function checks if all items in the array meet the given predicate. Below is an example of how to implement this:

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Usage Example

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Step 2: Creating allCloseTo

For comparing two DoubleArrays with a tolerance level, we can create the allCloseTo method. This function verifies whether the elements of one array are within a specified delta of the corresponding elements in another array.

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Usage Example

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Conclusion

By implementing these two methods, allMatchPredicate and allCloseTo, you can assert array conditions more concisely and elegantly in Kotlin. This not only improves code readability but also simplifies testing logic. In a world where simplicity and clarity prevail, using these assertions can save time and reduce errors in your codebase.

Ready to consolidate your assertions? Try implementing these methods in your Kotlin projects today!