D Documentation  
Concatenation
You can concatenate arrays (strings are arrays of course) with the cat operator ~.

Example 1:
char[] a = "He";
char[] b = "o world!";
char[] d = "l";
char[] c = a ~ d ~ "l" ~ b;     // c == "Hello world!"

Example 2:
static int[] a  = [1,2,3];
static int[] b  = [2,3];
int[] c  = a ~ b; // c is an array [1,2,3,2,3]


See also:
Array Setting and Operations
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