DART somo la 20: method zinazotumika kwenye map data type kwenye Dart

Tulishajifunza huko nyuma kuwa map data inakuwa na key na value. Pia tulijifunza jinsi ya lutengeneza map. Hapa kwanza tutaziona njia mbili za kutengeneza map ambazo hatukuzisoma huko mwanzoni.

At runtime

Hapa tutatengeneza data ya map wakati program inakuwa ina run

void main() {

 var websites = {};

 websites['jina'] = 'bongoclass';

 websites['umri'] = 5;

 websites['mmiliki'] = 'binafsi';

 websites['hali'] = 'ipo hai';

 print(websites);

}

Hii itatupa matokeo haya:-

{jina: bongoclass, umri: 5, mmiliki: binafsi, hali: ipo hai}

Kwa kutumia constructor 

Tutakuja kujifunza zaidi kuhusu constructor kwenye OOP. kw aufupi hii ni njia ambay hutumika kutengeneza object moja kwa moja. Hapa tutatumia new map()

void main() {

 var websites = new Map();

 websites['jina'] = 'bongoclass';

 websites['umri'] = 5;

 websites['mmiliki'] = 'binafsi';

 websites['hali'] = 'ipo hai';

 print(websites);

}

{jina: bongoclass, umri: 5, mmiliki: binafsi, hali: ipo hai}

Map properties:

1. Key hutumika kupata key za map
2. Values hutumika kupata value za map
3. Lenght hutumika kupata idadi ya item
4. isEmpty  kuangalia kama map ni tupu
5. isNotEmpty kuangali kama map sio tupu

void main() {

 var websites = new Map();

 websites['jina'] = 'bongoclass';

 websites['umri'] = 5;

 websites['mmiliki'] = 'binafsi';

 websites['hali'] = 'ipo hai';

 print('key');

 print(websites.keys);

 print('values');

 print(websites.values);

 print('length');

 print(websites.length);

 print('is empty');

 print(websites.isEmpty);

 print('is not empty'...