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DLang /

Index position of an element

See also std.algorithm.searching.

We're looking for an element in an array and we want to know where it is, at which index position.

(1) Where is it?
def main():
    li = [8, 5, 1, 3]

    # Where is 5? At which index position?
    idx = li.index(5)

    print(idx)  # 1

    print(li.index(99))  # ValueError exception (not found)
import std.stdio;
import std.algorithm.searching; // countUntil()

void main()
{
    int[] li = [8, 5, 1, 3];

    auto idx = li.countUntil(5);

    writeln(idx); // 1

    writeln(li.countUntil(99)); // -1 (not found)
}
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Page last modified on 2025 June 29, 22:23