Function garbageCollect

src/core/core.scale.js:71–83

* @param {object} caches * @param {number} length

(caches, length)

 * @param {number} length
 */
function garbageCollect(caches, length) {
  each(caches, (cache) => {
    const gc = cache.gc;
    const gcLen = gc.length / 2;
    let i;
    if (gcLen > length) {
      for (i = 0; i < gcLen; ++i) {
        delete cache.data[gc[i]];
      }
      gc.splice(0, gcLen);
    }
  });
}

/**
 * @param {object} options