For Loops

Apex supports three variations of the for loop:

• The traditional for loop, where init_stmt, exit_condition, increment_stmt, and code_block are placeholder values:

  1for (init_stmt; exit_condition; increment_stmt) {
  2    code_block
  3}

• The list or set iteration for loop, where variable must be of the same primitive or sObject type as list_or_set.

  1for (variable : list_or_set) {
  2    code_block
  3}

• The SOQL for loop:

  1for (variable : [soql_query]) {
  2    code_block
  3}

  or

  1for (variable_list : [soql_query]) {
  2    code_block
  3}

  Both variable and variable_list must be of the same sObject type as is returned by the soql_query.

Curly braces ({}) are required around a code_block only if the block contains more than one statement.

Note

Each is discussed further in the sections that follow.

• Traditional For Loops

• List or Set Iteration for Loops

• Iterating Collections