36 lines
792 B
JavaScript
36 lines
792 B
JavaScript
function rangeExtraction(list) {
|
|
var len = list.length;
|
|
var out = [];
|
|
var i, j;
|
|
|
|
for (i = 0; i < len; i = j + 1) {
|
|
// beginning of range or single
|
|
out.push(list[i]);
|
|
|
|
// find end of range
|
|
for (var j = i + 1; j < len && list[j] == list[j-1] + 1; j++);
|
|
j--;
|
|
|
|
if (i == j) {
|
|
// single number
|
|
out.push(",");
|
|
} else if (i + 1 == j) {
|
|
// two numbers
|
|
out.push(",", list[j], ",");
|
|
} else {
|
|
// range
|
|
out.push("-", list[j], ",");
|
|
}
|
|
}
|
|
out.pop(); // remove trailing comma
|
|
return out.join("");
|
|
}
|
|
|
|
// using print function as supplied by Rhino standalone
|
|
print(rangeExtraction([
|
|
0, 1, 2, 4, 6, 7, 8, 11, 12, 14,
|
|
15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
|
|
25, 27, 28, 29, 30, 31, 32, 33, 35, 36,
|
|
37, 38, 39
|
|
]));
|