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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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