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The AVERAGEIF function calculates the average of cells that meet a specified condition. For example, =AVERAGEIF(A1:A10, '>10', B1:B10) computes the average of values in B1:B10 where the corresponding cells in A1:A10 are greater than 10. This function is useful for conditional averaging in data analysis.

The CEILING function rounds a number up to the nearest multiple of a specified value. For example, =CEILING(5.3, 1) returns 6, as it rounds 5.3 up to the nearest whole number. This function is useful for rounding numbers in financial and statistical calculations.

The MATCH function searches for a specified item in a range and returns its relative position. For example, =MATCH('Apple', A1:A10, 0) returns the position of 'Apple' in the range A1:A10. This function is often used in combination with INDEX for flexible data retrieval.

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.

The INDEX function returns the value of a cell in a specified row and column within a range. For example, =INDEX(A1:C10, 2, 3) returns the value from the second row and third column in the range A1:C10. This function is useful for retrieving specific data points from a table.

The COUNTIF function counts the number of cells that meet a specific condition. For example, =COUNTIF(A1:A10, '>10') counts how many cells in the range A1:A10 contain values greater than 10. This function is useful for tallying occurrences that match a certain criterion.

The OFFSET function can be used to create dynamic ranges by adjusting its reference based on specified rows and columns. For example, =OFFSET(A1, 2, 3, 5, 5) creates a range starting 2 rows down and 3 columns over from A1, with a height of 5 rows and a width of 5 columns. This is useful for creating dynamic named ranges or adaptable formulas.

The VALUE function converts text that represents a number into a numeric value. For example, =VALUE('1234') converts the text '1234' into the number 1234. This function is useful when working with text values that need to be used in numerical calculations.

The HYPERLINK function can link to another sheet within the same workbook. For example, =HYPERLINK('#Sheet2!A1', 'Go to Sheet2') creates a link that takes you to cell A1 on Sheet2. This function is useful for navigating large workbooks and creating internal links.

The FLOOR function rounds a number down to the nearest multiple of a specified value. For example, =FLOOR(5.7, 1) returns 5, as it rounds 5.7 down to the nearest whole number. This function is useful for financial and statistical calculations requiring rounding down.

The NOT function reverses the logical value of its argument. For example, =NOT(A1>10) returns TRUE if A1 is not greater than 10, and FALSE if A1 is greater than 10. This function is useful for negating conditions in logical tests.

The IFERROR function returns a specified value if a formula results in an error; otherwise, it returns the result of the formula. For example, =IFERROR(A1/B1, 'Error') returns 'Error' if dividing A1 by B1 results in an error, otherwise it returns the division result. This function is useful for handling potential errors in calculations.

The PMT function calculates the payment for a loan based on constant payments and a constant interest rate. For example, =PMT(0.05/12, 360, 200000) calculates the monthly payment for a $200,000 loan at a 5% annual interest rate over 30 years. This function is useful for financial planning and loan calculations.

The ROUND function rounds a number to a specified number of digits. For example, =ROUND(123.456, 2) rounds 123.456 to 123.46. This function is useful for controlling the precision of numerical values in calculations and financial reports.

The DATEDIF function calculates the difference between two dates based on a specified unit. For example, =DATEDIF(A1, B1, 'D') returns the number of days between the dates in A1 and B1. You can also use 'M' for months or 'Y' for years. This function is useful for calculating age, tenure, or duration.

The OR function returns TRUE if any of its arguments are TRUE; otherwise, it returns FALSE. For example, =OR(A1>10, B1<5) returns TRUE if either A1 is greater than 10 or B1 is less than 5. This function is useful for evaluating multiple conditions where only one needs to be met.

The SUMPRODUCT function multiplies corresponding elements in arrays or ranges and returns the sum of these products. For example, =SUMPRODUCT(A1:A3, B1:B3) multiplies each value in A1:A3 by the corresponding value in B1:B3 and sums the results. This function is useful for weighted calculations and complex data analysis.

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 VLOOKUP function searches for a value in the first column of a table and returns a value from a specified column in the same row. For example, =VLOOKUP('Apple', A1:C10, 2, FALSE) searches for 'Apple' in column A and returns the corresponding value from column B. This function is useful for looking up information in tables.

JSX stands for JavaScript XML. It allows developers to write HTML-like code within JavaScript. In React Native, JSX makes it easier to create and manage components by embedding the UI layout directly within the JavaScript code. JSX is then compiled into React.createElement calls by Babel, translating into native code.

Expo is a set of tools and services built around React Native that makes it easier to build, deploy, and iterate on mobile applications. It provides a managed workflow with a range of pre-built libraries and components, and simplifies the process of setting up and maintaining a React Native project. Expo can be used for rapid development, but it also offers an 'ejected' workflow for more advanced use cases where you need full control over native code.

Asynchronous operations in React Native can be managed using JavaScript Promises or the async/await syntax. For example, you can use `fetch` with `async/await` to make HTTP requests. Additionally, you can use libraries like Axios for HTTP requests and manage side effects with `useEffect` or Redux for more complex scenarios.

`View` is a fundamental component used to create layouts and style containers in React Native. `SafeAreaView`, on the other hand, is designed to render content within the safe area boundaries of a device, avoiding notches, status bars, and other screen obstructions. It ensures that content is not hidden or clipped by these elements.

`useReducer` is a hook used in React Native to manage complex state logic in functional components. It works similarly to Redux's reducer, allowing you to manage state transitions through actions. It is useful for managing state that involves multiple sub-values or when the next state depends on the previous one. It provides better performance and clarity for complex state interactions.

In React Native, components are reusable building blocks that make up the UI of the application. They can be either class-based or functional. Components can be composed of other components, allowing for a modular and maintainable code structure. Examples include `<Text>`, `<View>`, and `<ScrollView>`.