Re: Finding position of a value in an array

[MoonlightSentinel via Digitalmars-d-learn]

On Sunday, 29 December 2019 at 08:31:13 UTC, mipri wrote:

On Sunday, 29 December 2019 at 08:26:58 UTC, Daren Scot Wilson wrote:

Reading documentation... Array, Algorithms, ... maybe I've been up too late... how does one obtain the index of, say, 55 in an array like this

    int[] a = [77,66,55,44];

I want to do something like:

    int i = a.find_value_returning_its_index(55);
    assert(i==2)

I'm sure it's obvious but I'm not seeing it right now.

int i = a.countUntil!(v => v == 55);
assert(i == 2);

A predicate isn’t required, countUntil accepts single elements:

int i = a.countUntil(55);