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.
42 lines
780 B
42 lines
780 B
4 weeks ago
|
'use strict';
|
||
|
|
|
||
|
|
const internals = {};
|
||
|
|
|
||
|
|
|
||
|
|
module.exports = function (array1, array2, options = {}) {
|
||
|
|
|
||
|
|
if (!array1 ||
|
||
|
|
!array2) {
|
||
|
|
|
||
|
|
return (options.first ? null : []);
|
||
|
|
}
|
||
|
|
|
||
|
|
const common = [];
|
||
|
|
const hash = (Array.isArray(array1) ? new Set(array1) : array1);
|
||
|
|
const found = new Set();
|
||
|
|
for (const value of array2) {
|
||
|
|
if (internals.has(hash, value) &&
|
||
|
|
!found.has(value)) {
|
||
|
|
|
||
|
|
if (options.first) {
|
||
|
|
return value;
|
||
|
|
}
|
||
|
|
|
||
|
|
common.push(value);
|
||
|
|
found.add(value);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return (options.first ? null : common);
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
internals.has = function (ref, key) {
|
||
|
|
|
||
|
|
if (typeof ref.has === 'function') {
|
||
|
|
return ref.has(key);
|
||
|
|
}
|
||
|
|
|
||
|
|
return ref[key] !== undefined;
|
||
|
|
};
|