LAMBDA for custom functions in Excel - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the LAMBDA function in Excel?

LAMBDA lets you create your own custom functions using Excel formulas without VBA or macros. You can reuse these functions like built-in ones.

beginner

How do you define parameters in a LAMBDA function?

You list parameters as the first arguments inside LAMBDA, followed by the formula using those parameters. For example, =LAMBDA(x, y, x + y) defines two parameters x and y.

intermediate

How can you use a LAMBDA function after defining it?

You can call it directly by passing arguments, or save it with a name using the Name Manager to reuse it anywhere in the workbook.

beginner

What happens if you forget to provide all parameters when calling a LAMBDA function?

Excel will return a #CALC! error because the function expects all parameters to be provided for calculation.

advanced

Can LAMBDA functions call themselves? What is this called?

Yes, LAMBDA functions can call themselves for repeated calculations. This is called recursion.

What does the LAMBDA function in Excel allow you to do?

A Import data from the web

B Automatically format cells

C Create custom reusable functions without VBA

D Create pivot tables

LAMBDA lets you write your own functions using formulas that you can reuse, without needing VBA or macros.

How do you specify inputs for a LAMBDA function?

A By listing parameters first inside the LAMBDA formula

B By naming cells outside the formula

C By using the IF function

D By creating a table

Parameters are listed as the first arguments inside the LAMBDA function before the formula.

What tool in Excel helps you save a LAMBDA function for reuse?

A Conditional Formatting

B Data Validation

C Goal Seek

D Name Manager

Name Manager lets you assign a name to your LAMBDA function so you can use it anywhere in the workbook.

What error appears if you call a LAMBDA function without all required parameters?

A #CALC!

B #REF!

C #VALUE!

D #NAME?

Missing parameters cause a #CALC! error because Excel cannot calculate the function properly.

What is it called when a LAMBDA function calls itself?

A Iteration

B Recursion

C Looping

D Nesting

Recursion is when a function calls itself to perform repeated calculations.

Explain how to create and use a simple LAMBDA function that adds two numbers.

Think about how you write a formula with inputs and reuse it.

Describe the benefits of using LAMBDA functions instead of repeating formulas in Excel.

Consider how custom functions help avoid mistakes and save time.