var s = make([]int, 6)
var b = make([]byte, 5)
n1 := copy(s, a[0:])            // n1 == 6, s is []int{0, 1, 2, 3, 4, 5}
n2 := copy(s, s[2:])            // n2 == 4, s is []int{2, 3, 4, 5, 4, 5}
n3 := copy(b, "Hello, World!")  // n3 == 5, b is []byte("Hello")
</pre>


<h3 id="Clear">Clear</h3>

<p>
The built-in function <code>clear</code> takes an argument of <a href="#Map_types">map</a>,

    <glob pattern="*.manifest"/>
    <glob pattern="*.m4"/>
    <glob pattern="*.mf"/>
    <glob pattern="*.MF"/>
    <glob pattern="*.meta"/>
    <glob pattern="*.mdo"/>
    <glob pattern="*.n3"/>
    <glob pattern="*.pen"/>
    <glob pattern="*.pod"/>
    <glob pattern="*.pom"/>
    <glob pattern="*.project"/>
    <glob pattern="*.rng"/>
    <glob pattern="*.rnx"/>
    <glob pattern="*.roles"/>