Function isArray

isArray(arr): boolean
Checks if the input is an array.
Parameters
- arr: unknown
  The input to be checked if it is an array.
Returns boolean
true if the input is an array, false otherwise.
Example
```
const arr1 = [1, 2, 3];
const arr2 = 'not an array';

console.log(isArray(arr1)); // true
console.log(isArray(arr2)); // false
```

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