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