every

The every() function will return true if all items in a list match the condition (unlike some, which only requires at least one element to match it).

every(list, condition)

list.every(condition)
Code language: JavaScript (javascript)

Example formulas

[1, 2, 3, 4, 5].every(
  current > 0
)

/* Output: true */
Code language: JavaScript (javascript)

You can use every() to validate dates. Note how the last date in this example list is invalid:

["1999-04-01", "2023-01-25", "2025-13-32"].every(
  current.parseDate()
)

/* Output: false */
Code language: JavaScript (javascript)

You can also use every() to run a check on a specific property within every page in a Relation property. For example, let’s say we want to check whether or not every task in a project is done:

prop("Tasks").every(
  current.prop("Status") == "Done"
)

/* Sample Output: false */
Code language: JavaScript (javascript)

Once you have this value in a formula property, you could even filter a database view by it in order to show only projects that have incomplete tasks.