diff options
| -rw-r--r-- | public/common/util.js | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/public/common/util.js b/public/common/util.js index 75cd824..0979178 100644 --- a/public/common/util.js +++ b/public/common/util.js @@ -304,3 +304,26 @@ function object_diff(a, b) { } return true } + +// same as Object.groupBy +function object_group_by(items, callback) { + let groups = {} + if (typeof callback === "function") { + for (let item of items) { + let key = callback(item) + if (key in groups) + groups[key].push(item) + else + groups[key] = [ item ] + } + } else { + for (let item of items) { + let key = item[callback] + if (key in groups) + groups[key].push(item) + else + groups[key] = [ item ] + } + } + return groups +} |