diff options
Diffstat (limited to 'devtools/client/framework/test/code_binary_search.coffee')
| -rw-r--r-- | devtools/client/framework/test/code_binary_search.coffee | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/devtools/client/framework/test/code_binary_search.coffee b/devtools/client/framework/test/code_binary_search.coffee new file mode 100644 index 0000000000..e3dacdaaab --- /dev/null +++ b/devtools/client/framework/test/code_binary_search.coffee @@ -0,0 +1,18 @@ +# Uses a binary search algorithm to locate a value in the specified array. +window.binary_search = (items, value) -> + + start = 0 + stop = items.length - 1 + pivot = Math.floor (start + stop) / 2 + + while items[pivot] isnt value and start < stop + + # Adjust the search area. + stop = pivot - 1 if value < items[pivot] + start = pivot + 1 if value > items[pivot] + + # Recalculate the pivot. + pivot = Math.floor (stop + start) / 2 + + # Make sure we've found the correct value. + if items[pivot] is value then pivot else -1
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