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November 23, 2017 08:33
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Binary Search JS
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title></title> | |
| <script type="text/javascript"> | |
| 'use strict'; | |
| var data = []; | |
| for (var i = 0; i < 999999; i++) { | |
| data.push(i); | |
| } | |
| function binSearch(arrData, searchVal){ | |
| var fromSearch = 0; | |
| var toSearch = arrData.length-1; | |
| while(true){ | |
| var half = parseInt((fromSearch + toSearch) / 2); | |
| if(arrData[half] < searchVal){ | |
| fromSearch = half; | |
| if(half+1 == toSearch){ | |
| return toSearch; | |
| } | |
| }else if(arrData[half] > searchVal){ | |
| toSearch = half; | |
| }else if(arrData[half] === searchVal){ | |
| return half; | |
| }else{ | |
| return -1; | |
| } | |
| } | |
| return -1; | |
| } | |
| console.time("asdf"); | |
| console.log(data[binSearch(data, 123123)]); | |
| console.timeEnd("asdf"); | |
| </script> | |
| </head> | |
| <body> | |
| </body> | |
| </html> |
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