one questions

`Array.prototype.some` tests whether at least one element in the array passes a provided test function. It returns `true` if at least one element satisfies the condition, otherwise `false`. It does not modify the original array. 

const arr = [1, 2, 3];
const hasEven = arr.some(num => num % 2 === 0);
console.log(hasEven); // true

`Array.prototype.unshift` adds one or more elements to the beginning of an array and returns the new length of the array. It modifies the original array. 

const arr = [2, 3];
arr.unshift(1);
console.log(arr); // [1, 2, 3]

`Array.prototype.some` tests whether at least one element in the array passes a provided test function. It returns `true` if at least one element satisfies the condition, otherwise `false`. It does not modify the original array. 

const arr = [1, 2, 3];
const hasEven = arr.some(num => num % 2 === 0);
console.log(hasEven); // true

`String.prototype.concat` combines multiple strings into one string. It does not modify the original strings but returns a new concatenated string. 

const str1 = 'hello';
const str2 = 'world';
const combined = str1.concat(' ', str2);
console.log(combined); // 'hello world'

The LOOKUP function searches for a value in one row or column and returns a value from the same position in a second row or column. For example, =LOOKUP(10, A1:A10, B1:B10) looks for the number 10 in A1:A10 and returns the corresponding value from B1:B10. This function is useful for simple lookups and data retrieval.