1. Array.prototype.includes()
The includes() the method determines whether an array includes a certain value among its entries, returning true or false as appropriate.
2. Array.prototype.indexOf()
The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.
3. Array.isArray()
The Array.isArray() static method determines whether the passed value is an Array.
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