Stream is used in Manipulating collection
List<Integer> num = new ArrayList<>();
num.add(10);
num.add(20);
num.add(30);
num.add(40);
List<Integer> cubeList = num.stream().map(x -> x*x*x).collect(Collection.toList());
// get string from list to collect string starts with a
List<String> strlist = strlist.stream().filter(s -> s.startsWith("a")).collect(Collection.toList());
To take sum of list
int sum = numList.stream().reduce(0, (and, i) -> ans + i );
import java.util.ArrayList
List<Integer> arrList = new ArrayList<Integer>(10);
arrList.add(1);
arrList.add(2);
arrList.add(3);
arrList.add(4);
arrList.add(5);
arrList.add(6);
System.out.println(arrList); 1,2,3,4,5,6
arrList.remove(3); remove 3rd element that is 4
LinkedList
LinkedList<String> linkist = new LinkedList<String>();
linkist .add("A");
linkist .addLast("C");
linkist .addFirst("D");
linkist .add(2,"B");
// D A B C
linkist .remove("C");
linkist .add(2); //by position
linkist .removeFirst("A");
linkist .removeLast("A");
Hashset
Set<String> hashset = new HashSet<>();
boolean ret = bhashset.add("A"); //true if added false if not added
hashset.add("B");
hashset.add("B"); ///return false here
hashset.contains("A");
hashset.remove("A");
HashMap
Map<String, Integer> hmap = new HashMap<>();
hmap.put("a",10);
hmap.put("b",20);
hmap.put("c",30);
// { a=10, b=20, c=30}
hmap.size(); // 3
hmap.containsKey("a"); //boolean
hmap.get("a");
hmap.keySet(); // array of keys
for(String k: hmap.keySet()){
// hmap.get(k);
}
for(Entry <String, Integer> data : hmap.entrySet()){
// data.getKey();
// data.getValue();
}
TreeSet
Naturally sorted in Treeset
TreeSet<String> tset = new TreeSet<String>();
tset.add("B");
tset.add("A");
tset.add("C");
tset.add("C");
// A, B, C // sort //ordered by default
TreeMap
Naturally sorted in Treeap
Map< Integer, String> tmap= new HashMap<>();
tmap.put(1,"a");
mtap.put(2,"b");
tmap.put(3,"c");
// {1=a,2=b,3=c}
Map< String, Integer> tmap= new HashMap<>();
tmap.put("b",2);
mtap.put("a",1);
tmap.put("c",3);
// {a=1,b=2,c=3}
Stacks
Stack <String> stack = new Stack<>();
stack.push("A");
stack.push("B");
stack.push("C");
String poped = stack.pop(); // C remove from stack
String peeked = stack.peek(); // C , doesnt remove from stack
//Stack is filo
Queue
// fifo arrangement
Queue<> que = new PriorityQueue<>();
que .push("A");
que .push("B");
que .push("C");
que.remove(); //
que.peek(); //
que.poll(); //
<script type="text/template" data-template="apkItem">
<div class="apk-box">
<div class="apk-version d-flex align-items-center justify-content-between">
<div class="divider">
<div class="title">
<span class="ver-name">${version_name} </span><span class="date">${updated_on}</span>
</div>
<a class="ver-link" href="javascript:void(0);">${apk_filename}</a>
</div>
<a style="display:none" href="./app/${apk_filename}" class="dl-btn download_allow" data-download-allow="${download_allow}">
<svg xmlns="http://www.w3.org/2000/svg" height="48" viewBox="0 96 960 960" width="48"><path d="M220 896q-24 0-42-18t-18-42V693h60v143h520V693h60v143q0 24-18 42t-42 18H220Zm260-153L287 550l43-43 120 120V256h60v371l120-120 43 43-193 193Z"/></svg>
</a>
</div>
<div class="apk-info">
<span class="memo">メモ</span><br>
<p>${update_memo}</p>
</div>
</div>
</script>
<script type="text/javascript" src="./js/jquery-3.6.4.js"></script>
<script type="text/javascript">
function render(props) {
return function (tok, i) {
return (i % 2) ? props[tok] : tok;
};
}
$(document).ready(function(){
$.getJSON('./json/data.json', function (data) {
var header = data.app_header;
var headerEl = $(".apk-logo-wrapper");
var headerTpl = $('script[data-template="header"]').text().split(/\$\{(.+?)\}/g);
headerEl.html(headerTpl.map(render(header)).join(''));
var list = data.version_info;
var listEl = $(".apk-wrapper");
var listTpl = $('script[data-template="apkItem"]').text().split(/\$\{(.+?)\}/g);
listEl.html(list.map(function (item) {
return listTpl.map(render(item)).join('');
}));
$(".download_allow[data-download-allow='1']").show();
});
});
</script>
$db = app('firebase.firestore')->database();
$firebaseDoc = $db->collection(config('constants.firebase_collection_timesles'))->document($timesale->id);
$message = "";
if(!empty($timesale->product) && !empty($timesale->product->column_1_191)) {
$message = $timesale->product->column_1_191;
}
$update = $firebaseDoc->set([
],['merge'=>true]);
Angular
Generate Module:
ng g m modules\<module-name> --routing
Generate Component:
ng g c modules\<module-name>\components\<component-name>
Generate Model (Class):
ng g class modules\<module-name>\models\<model-name> --type=model
Generate Service:
ng g s modules\<module-name>\services\<service-name>
Generate guard:
ng g guard shared\guard/...
Package : https://github.com/kitloong/laravel-migrations-generator
php artisan migrate:generate
Possible error: Unknown database type bit requested, Doctrine\DBAL\Platforms\PostgreSQL94Platform may not support it.
Temporary Fixes:
Edit file in line 423:
vendor\doctrine\dbal\src\Schema\PostgreSQLSchemaManager.php
if($dbType=='bit') {
$dbType = "boolean";
}
Execute : skipping view and procedure
php artisan migrate:generate --skip-views --skip-proc