clear method
Clears the value at key
from the cache, if it exists. Returns itself for
method chaining.
Implementation
DataLoader<K, V, C> clear(K key) {
final cacheMap = this._cacheMap;
if (cacheMap != null) {
final cacheKey = this._cacheKeyFn(key);
cacheMap.delete(cacheKey);
}
return this;
}