Functions act as placeholders for the data they output. Basically, you can assign the output of a function to a variable, just like any normal data.The core concept of this lesson is to learn how to call a function and assign the return value to a variable. FreeCodeCamp offers a curriculum and in this video we cover their lesson called Assignment with a Returned Value. Display the first, middle and last values as it goes through the process. Clearly indicate what these values are. We can take the return value of a function and assign it to a variable. Assume we have pre-defined a function sum which adds two numbers together. When we have variables and we're assigning it to a value what's the saying is that whenever we have a whatever is on the right of the equal sign. The residential department is responsible for determining the market value for all of the residential properties in Tarrant County (around 600,000 residential.