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Indexing and Iteration ​

Once you have a slice, these are the everyday ways to reach its elements: by position, in a loop, or by spreading them into a call.

Indexing ​

Use [i] to read or write a single element. The index is zero-based, so valid indices run from 0 to length - 1:

rux
let colors = ["red", "green", "blue"];
let first  = colors[0];   // "red"
colors[2]  = "cyan";      // write through the slice

Indexing goes through the slice's data pointer, so a write updates the underlying memory that the slice views.

Iteration ​

for … in walks every element in order, binding each to the loop variable:

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let nums = [1, 2, 3, 4, 5];
var sum = 0;
for n in nums {
    sum += n;
}

This reads length from the header, so it always covers exactly the elements the slice describes. See for for the full loop syntax.

Spread ​

Pass all elements of a slice as individual arguments to a variadic function with …:

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func Max(values: int32...) -> int32 { /* … */ }

let data = [3, 1, 4, 1, 5, 9];
let m = Max(data...);   // equivalent to Max(3, 1, 4, 1, 5, 9)

See Variadic Functions for how the receiving function declares and reads its arguments.

See Also ​