values questions

`Array.prototype.values` returns a new Array Iterator object that contains the values for each index in the array. It allows iteration over the array's values. 

const arr = ['a', 'b', 'c'];
const iterator = arr.values();
for (const value of iterator) {
  console.log(value);
}
// Output:
// 'a'
// 'b'
// 'c'

To sum values across multiple sheets, use a formula like =SUM(Sheet1:Sheet3!A1) which sums the values in cell A1 across Sheet1, Sheet2, and Sheet3. This method is useful for aggregating data from multiple sheets into a single total.

The Context API in React Native allows you to pass data through the component tree without having to pass props manually at every level. You create a Context object using `React.createContext`, and then use `Provider` and `Consumer` components to manage and access the context data. This is useful for global state management and theme handling.