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Programming in D: The Ultimate Guide for Software Engineers

foreach Loop

Explore the foreach loop in D programming to efficiently iterate over arrays, strings, associative arrays, and user-defined types. Understand its syntax, usage with different containers, and controlling flow with break and continue. This lesson helps you write cleaner and more flexible iteration code in D.

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What is the foreach loop?

One of the most commonly used statements in D is the foreach loop. It is used to perform the same operation to every element of a container (or a range).

Operations that are applied to elements of containers are very common in programming. We have seen in the for loop lesson that the elements of an array are accessed with an index value that is incremented at each iteration:

D
import std.stdio;
void main() {
    int [] array = [1, 2, 3, 4, 5];
    for (int i = 0; i < array.length; ++i) {
        writeln(array[i]);
    }
    
}

The following steps are involved in iterating over all the elements:

  • Defining a variable as a counter, which is conventionally named as i

  • Iterating the loop up to the value of the .length property of the array ...