| 1 | /**
|
| 2 | * generates a UID factory
|
| 3 | * @internal
|
| 4 | * @example
|
| 5 | * const uid = generateUID();
|
| 6 | * uid(object) = 1;
|
| 7 | * uid(object) = 1;
|
| 8 | * uid(anotherObject) = 2;
|
| 9 | */
|
| 10 | export var generateUID = function () {
|
| 11 | var counter = 1;
|
| 12 | var map = new WeakMap();
|
| 13 | /**
|
| 14 | * @borrows {uid}
|
| 15 | */
|
| 16 | var uid = function (item, index) {
|
| 17 | if (typeof item === 'number' || typeof item === 'string') {
|
| 18 | return index ? "idx-".concat(index) : "val-".concat(item);
|
| 19 | }
|
| 20 | if (!map.has(item)) {
|
| 21 | map.set(item, counter++);
|
| 22 | return uid(item);
|
| 23 | }
|
| 24 | return 'uid' + map.get(item);
|
| 25 | };
|
| 26 | return uid;
|
| 27 | };
|
| 28 | /**
|
| 29 | * @name uid
|
| 30 | * returns an UID associated with {item}
|
| 31 | * @param {Object} item - object to generate UID for
|
| 32 | * @param {Number} index, a fallback index
|
| 33 | * @example
|
| 34 | * uid(object) == 1;
|
| 35 | * uid(object) == 1;
|
| 36 | * uid(anotherObject) == 2;
|
| 37 | * uid("not object", 42) == 42
|
| 38 | *
|
| 39 | * @see {@link useUID}
|
| 40 | */
|
| 41 | export var uid = generateUID();
|