Google Sheets | ARRAYFORMULA | Function | How to Use | Example | Spreadsheet | Tutorial

The Google Sheets ARRAYFORMULA function's result automatically expands to multiple rows and or columns. This function also assists to use an array as an argument in a function that does not support the same. Some examples of such functions are IF and LEN.
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Syntax of Array Function Formula
=ARRAYFORMULA(array_formula)
Start the formula with an equal-to symbol
ARRAYFORMULA is the name of the function.
array_formula is the argument. It can be a range or an expression with one or more ranges. In case of the latter, the ranges should be of the same size. The argument can also be a function whose result fills more than one cell.
Example of Array Function Formula
Example 1
Using an Expression in ARRAYFORMULA
=ARRAYFORMULA(A2:A6+B2:B6)
The above formula adds each value in the range A2 to A6 with each of its
corresponding value in the range B2 to B6 and displays the first result of the addition in the cell with the formula and automatically expands the results to four cells below the cell with the formula.
Example 2
Using a Function in ARRAYFORMULA
=ARRAYFORMULA(IF(H2:H132="JR347", "Check Inventory", "---" ))
Because the IF function does not support the use of an array in the logical expression, IF can be nested inside ARRAYFORMULA and an array can be used. IF checks whether any of the cell in the range H2 to H132 has the text JR347, and if a cell does, then its corresponding cell will be assigned the text Check Inventory. Otherwise, cells without the text JR347 will be assigned three dashes.
Review this video tutorial, which gives the steps to use the Google Sheets ARRAYFUNCTION with examples.