public ImmutableDoubleDoubleMap newWithKeyValue(double key, double value)
{
MutableDoubleDoubleMap map = new DoubleDoubleHashMap(this.size() + 1);
map.putAll(this);
map.put(key, value);
return map.toImmutable();
}
public ImmutableDoubleDoubleMap newWithoutKey(double key)
{
MutableDoubleDoubleMap map = new DoubleDoubleHashMap(this.size());