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Programming-Idioms

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  • Kotlin

Idiom #196 Pass a sub-array

Given an integer array a of size n, pass the first, third, fifth and seventh, ... up to the m th element to a routine foo which sets all these elements to 42.

fun foo(a : IntArray, idx: IntProgression) = 
  idx.forEach{ a[it] = 42 }
foo(a, 0 .. (m-1) step 2)
void Foo(out int element)
{
    element = 42;
}

for (int i = 0; i < m; i += 2)
{
    Foo(out a[i]);
}

a.Length is the size of a at run-time.

Requires m <= a.Length; the code does not verify this beforehand.

References to individual elements are passed to Foo().

New implementation...
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tkoenig