ForEach method
Implementation
void ForEach(bool Function(dynamic key, dynamic value) step) {
for(var key in this.keys) {
if(step(key,this[key]) == false)
break;
}
}
void ForEach(bool Function(dynamic key, dynamic value) step) {
for(var key in this.keys) {
if(step(key,this[key]) == false)
break;
}
}