12 - Test if an Array Contains an Item - Quality Assurance with Chai - freeCodeCamp Tutorial
The include() and notInclude() methods are really useful. They can be used to check if an array contains a particular element, or to query an object. The first argument is the item we are looking in, and the second argument is the value we are looking for.
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0:00 - Concepts:
0:07 - assert.include()
Asserts that haystack includes needle. Can be used to assert the inclusion of a value in an array, a substring in a string, or a subset of properties in an object. Strict equality (===) is used. When asserting the inclusion of a value in an array, the array is searched for an element that’s strictly equal to the given value. When asserting a subset of properties in an object, the object is searched for the given property keys, checking that each one is present and strictly equal to the given property value.
https://www.chaijs.com/api/assert/#me...
02:14 - assert.notInclude()
Asserts that haystack does not include needle. Can be used to assert the absence of a value in an array, a substring in a string, or a subset of properties in an object. Strict equality (===) is used. When asserting the absence of a value in an array, the array is searched to confirm the absence of an element that’s strictly equal to the given value. When asserting a subset of properties in an object, the object is searched to confirm that at least one of the given property keys is either not present or not strictly equal to the given property value.
https://www.chaijs.com/api/assert/#me...
03:35 - Challenge Solution
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Chai is an assertion library, similar to Node's built-in assert. It makes testing much easier by giving you lots of assertions you can run against your code.
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