func (m *Map) IncKeyBy(key string, delta NumValue) {
	m.mu.Lock()
	defer m.mu.Unlock()
	if m.m[key] == nil {
		m.newKey(key)
	}
	m.m[key].IncBy(delta)
}
// IncKeyBy increments the given key's value by NumValue.
IncKeyBy increments the given key's value by NumValue.
// IncKeyBy increments the given key ' s value by NumValue .
func (m *Map) IncKeyBy(key string, delta NumValue) {
	m.mu.Lock()
	defer m.mu.Unlock()
	if m.m[key] == nil {
		m.newKey(key)
	}
	m.m[key].IncBy(delta)
}
func ( m * Map ) IncKeyBy ( key string , delta NumValue ) { m . mu . Lock ( ) defer m . mu . Unlock ( ) if m . m [ key ] == nil { m . newKey ( key ) } m . m [ key ] . IncBy ( delta ) }
IncKeyBy increments the given key's value by NumValue.
IncKeyBy increments the given key ' s value by NumValue .