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| "use strict"
|
| function unique_pred(list, compare) {
| var ptr = 1
| , len = list.length
| , a=list[0], b=list[0]
| for(var i=1; i<len; ++i) {
| b = a
| a = list[i]
| if(compare(a, b)) {
| if(i === ptr) {
| ptr++
| continue
| }
| list[ptr++] = a
| }
| }
| list.length = ptr
| return list
| }
|
| function unique_eq(list) {
| var ptr = 1
| , len = list.length
| , a=list[0], b = list[0]
| for(var i=1; i<len; ++i, b=a) {
| b = a
| a = list[i]
| if(a !== b) {
| if(i === ptr) {
| ptr++
| continue
| }
| list[ptr++] = a
| }
| }
| list.length = ptr
| return list
| }
|
| function unique(list, compare, sorted) {
| if(list.length === 0) {
| return list
| }
| if(compare) {
| if(!sorted) {
| list.sort(compare)
| }
| return unique_pred(list, compare)
| }
| if(!sorted) {
| list.sort()
| }
| return unique_eq(list)
| }
|
| module.exports = unique
|
|
