foreach

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The length of the array is determined before the first iteration, so if the array is changed during the foreach this will not be reflected in the number of iterations.

Simple form

simple-form

foreach ([element_type] value; array) {

}

This loops over the members of array. For each iteration, it copies the current member to value and then executes statement. For example:

int an_array[] = {1, 2}
foreach (int num; an_array) {
    printf("%d", num);
}

Enumerated form

enumerated-form

The second form lets you specify an enumeration variable:

foreach (index, value; array) statement;
foreach (int index; element_type value; array) statement;

For each iteration, this form assigns the current position in the array to index, copies the current member to value, and executes statement. For example:

string days[] = { "Mon", "Tue", "Wed", "Thu", "Fri" }
foreach (int i; string name; days) {
    printf("Day number %d is %s", i, name);
}

This is similar to the common Python idiom for i, x in enumerate(xs):.