For statements

The for..in statement is used to iterate the keys of an object.

for (const key in map) {
    trace(key)
}

The for each statement is used to iterate the values of an object.

for each (const value in array) {
    trace(value)
}

Syntax

ForStatement^ω :
for ( ForInitializer ; ListExpression^allowIn_opt ; ListExpression^allowIn_opt ) Substatement^ω
for ( ForInBinding in ListExpression^allowIn ) Substatement^ω
for [no line break] each ( ForInBinding in ListExpression^allowIn ) Substatement^ω

ForInitializer :
«empty»
ListExpression^noIn
VariableDefinition^noIn

ForInBinding :
PostfixExpression
VariableDefinitionKind VariableBinding^noIn