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.map(): This is a method called on the keywordsArray array.

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keyword => [${keyword.trim()}]): This is an arrow function that takes each element (keyword`) of the array and transforms it. In this case, it wraps each keyword in square brackets after trimming any leading or trailing whitespaces.

wrappedKeywordsArray: This is the new array created by the map function, where each element corresponds to the original keywords wrapped in square brackets.

So, for each keyword in the keywordsArray, the map function applies the arrow function, resulting in a new array (wrappedKeywordsArray) where each keyword is wrapped in square brackets. This is a concise way to perform the same operation on each element of an array and create a new array with the transformed values.