You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
19 lines
375 B
19 lines
375 B
/** |
|
* Groups array items into a Map, given a function to produce grouping key. |
|
*/ |
|
export function groupBy(list, keyFn) { |
|
const result = new Map(); |
|
|
|
for (const item of list) { |
|
const key = keyFn(item); |
|
const group = result.get(key); |
|
|
|
if (group === undefined) { |
|
result.set(key, [item]); |
|
} else { |
|
group.push(item); |
|
} |
|
} |
|
|
|
return result; |
|
}
|
|
|