ClosedBit Guide Part 6: Errors

#Part 6. Errors

#Part 6 Section 1. Read The First Error

The first error usually names the real problem. Later lines often describe fallout from that first issue. If the message includes a /docs/errors/ URL, open it.

Error	Meaning	First fix
`CB_ERR_ARRAY_INDEX`	Code read outside an array	Check the index against `len(array)`
`CB_ERR_DIVIDE_BY_ZERO`	Division used zero	Guard the divisor or use `math.divide_or`
`CB_ERR_UNKNOWN_FUNCTION`	Function is not known	Fix the name or import the right library
`CB_ERR_LICENSE_REQUIRED`	Build license is not active	Sign in through Studio Settings
`CB_ERR_PACKAGE_INVALID`	Runtime rejected the package	Rebuild from source

#Part 6 Section 2. Custom Popups

Use CB-Popup for errors a user needs to see.

library CB-Popup

fn main() {
    try {
        array rows = [10, 20]
        println(rows[5])
    } catch {
        CB-Popup.error("CB_ERR_ARRAY_INDEX", "That row does not exist.")
        println(CB-Popup.error_url("CB_ERR_ARRAY_INDEX"))
    }
}

Use logs for developer detail. Use popups for clear user action.