Note: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.

Loops

Apex supports five types of procedural loops.

These types of procedural loops are supported:

do {statement} while (Boolean_condition);
while (Boolean_condition) statement;
for (initialization; Boolean_exit_condition; increment) statement;
for (variable : array_or_set) statement;
for (variable : [inline_soql_query]) statement;

All loops allow for loop control structures:

break; exits the entire loop
continue; skips to the next iteration of the loop

Apex Developer Guide

Loops