ssl

open/vuew jks cert: jre/bin/ikeyman.exe

js

https://jsonplaceholder.typicode.com/posts

var firstName = "Jamila";

console.log(typeof firstName); //string

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference

console.log(Object.values(person));

console.log(Object.keys(person));

console.log(JSON.stringify(person))

const advice = document.querySelector(".advice");

advice.textContent = "asdf";

btn.addEventListener("click", fnBtn);

arrays: map find reduce sort

datas = [{id:1,title:'adsf'},{id:2},{title:'asdf3}]

datas.find((id)=> d.id===id)

const id = data?.id? ?? 0;

const arry = [1,2,3]

console.log(arry.map((el)=>el*2)) //2,4,6

console.log(datas.map((el)=>el.id)//1,2

const dataNew = datas.map((data)=>({

        dataId:data.id;

        dataTitle: data.title;

}))

 const pages = books.reduce((accu,book)=>accu + book.pages,0);

//initial value could be a number 0, array [], object {})

//unlike map filter, the sort mutated the array

[2,1,3].sort((a,b)=>a-b) //[1,2,3]

//to preserve the original array, we create a copy first:

data.slice().sort(a,b=>b-a)

const booksAfter = [...books, newBook] //spread operator (not rest)

Java

 https://www.youtube.com/watch?v=X80nJ5T7YpE Spring Boot + JWT

https://www.youtube.com/watch?v=t4-416mg6iU  OAuth

/libs/some.jar

mvn install:install-file -Dfile=some.jar -DgroupId=asdf.com -DartifactId=artif -Dversion=1.9.9 -Dpackaging=jar -DgeneratePom=true

power supply

 https://www.youtube.com/watch?v=oqVrS08UOW8

Импульсные СТАБИЛИЗАТОРЫ НАПРЯЖЕНИЯ и ТОКА. Как они работают

SEPIC - повышающий и понижающий стабилизатор