How Can I Efficiently Check for Array Intersection in JavaScript?

Array Intersection Check in JavaScript

Determining whether one array contains any element present in another array is a common programming task. Consider a target array like ["apple", "banana", "orange"]. We want to efficiently check if other arrays include any elements from the target array.

For instance:

• ["apple", "grape"] → returns true (contains "apple")
• ["apple", "banana", "pineapple"] → returns true (contains "apple" and "banana")
• ["grape", "pineapple"] → returns false (no target array elements present)

To perform this check in JavaScript, we have the following solution:

Vanilla JavaScript:

const found = array1.some(r => array2.includes(r));

Explanation:

• The some() method iterates over each element in array1 and applies a test function.
• The test function includes() checks if the current element r is present in array2.
• If any element in array1 is found in array2, some() returns true, indicating that the arrays intersect. Otherwise, it returns false.

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