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Trigger context variables

Boolean flags like Trigger.isUpdate and Trigger.isBefore describe the current run — pick an event and watch the row update.

Context

When:

Variable	Value (toy)
Trigger.isInsert	false
Trigger.isUpdate	true
Trigger.isDelete	false
Trigger.isUndelete	false
Trigger.isBefore	true
Trigger.isAfter	false
Trigger.size	3
Trigger.operationType	UPDATE

Use these flags to branch logic instead of guessing from Trigger.new alone.

Example branch

if (Trigger.isBefore && Trigger.isUpdate) {
    // validate before save
}
if (Trigger.isAfter && Trigger.isInsert) {
    // follow-up work — watch recursion & limits
}