Source code in the d programming language

int[3] array;
array[0] = 5;
// array.length = 4; // compile-time error


int[] array;
array ~= 5; // append 5
array.length = 3;
array[3] = 17; // runtime error: out of bounds. check removed in release mode.
array = [2, 17, 3];
writefln(array.sort); // 2, 3, 17


int[int] array;
// array ~= 5; // it doesn't work that way!
array[5] = 17;
array[6] = 20;
// prints "[5, 6]" -> "[17, 20]" - although the order is not specified.
writefln(array.keys, " -> ", array.values);
assert(5 in array); // returns a pointer, by the way
if (auto ptr = 6 in array) writefln(*ptr); // 20