【ES6】適当に試したり。正規表現とか

全コード


function getKey(k) {
  return `${k}`;
}

const obj = {
  id: 5,
  name: 'San Francisco',
  [getKey('enabled')]: true,
};

console.log(obj)
///////////////////////////


function f(x, ...y) {//ここで受け取らない分が配列の要素としてyになる
  // y is an Array
  console.log(y)//["hello","true"]
  return x * y.length;
}
const r1 = f(3, "hello", true) == 6
console.log(r1);//true

//////////////////////////////

function f(x, y, z, t, p) {//インデックス順に受け取る
  console.log(z);
  return x + y + z;
}
// Pass each elem of array as argument
//const arry = [1,2,3,5,6];
//f(...arry) == 6
//or
f(...[1,2,4]);


///////////////////////////////

let fibonacci = {
  [Symbol.iterator]() {
    let pre = 0, cur = 1;
    return {
      next() {
        console.log([pre, cur] = [cur, pre + cur]);
        return { done: false, value: cur }
      }
    }
  }
}

//////////////////////

let [a, b, c] = []
console.log(a,b,c);
typeof b

function getSomething(){
  return {
    first: 1,
    second: 2,
    third: 3
  }
}

var { first, second, third } = getSomething();
console.log(first)


console.log("repeat".repeat(2));

console.log(["morita","kenji","fafafa"].findIndex(x => x == "fafafa"))

console.log(["A","B","C"].map(x => Array.of(x)));

console.log(['a', 'b', 'c'].fill('kenji', 1, 2));

const i = [3, 0, 6, -1].find(x=> x < 0);
console.log(i)

function* idMaker(){
    var index = 0;
    while(true)
        yield index++;
}

const gen = idMaker();
console.log(gen)
////////////////////////////

const str = "わたしの名前は「もりた」です。あだなは「もりけん」です";

const re = /「.*?」/ig;


const myRe=/ken*/g;
const str2 = "fafakenfafkenji";
let array;
while ((array = myRe.exec(str2)) !== null) {
 let msg = array[0] + " を見つけました。";
  msg += "次のマッチは " + myRe.lastIndex + " からです。";
  console.log(msg);
}



const str3 = "<img src='fafa.com'>"
const str4 = "<p>"
const reg2 = /<(\S+)(\s+.+)?>/;
const reg3 = /<(?:\S+)(?:\s+.+)?>/;
const re2 = str3.match(reg2);
const re3 = str3.match(reg3);
const re4 = str4.match(reg2);
console.log(re2);console.log(re2[0]);
console.log(re3);console.log(re3[0]);
console.log(re4);console.log(re4[0]);


const str222 = "わたしの名前は「もりた」です。あだなは「もりけん」です";

const re222 = /「(.+?)」/ig;


let result;
while ((result = re222.exec(str222)) !== null){
  console.log(result[0],"ここ")
}

const nen = "西暦1980年の3581歳です";
const reg1 = /\d+(?=年)/;
console.log(nen.match(reg1))

const string3 = "washable reasonable accessible assemble answerable";
const reg5 = /\b\w+(?=able\b)/g;
console.log(string3.match(reg5));

const nen1 = "ケンジは昭和55年生まれの35歳であり、ケンジの母は昭和22年生まれの64歳である"
const reg6 = /\d+(?![年\d])/g;
console.log(nen1.match(reg6));

const str5 = "あの客はよく柿食う客だ";
const res5 =str5.match(/あの(.+)はよく柿食う\1だ/);
console.log(res5);

const tag = "<div><h1>kenjimorita.jp</h1></div>";

console.log(/<(\w+)><(\w+)>kenjimorita.jp<\/\2><\/\1>/.test(tag))

// const str6 = "西暦2010年は平成22年です。西暦1980年は昭和55年です。";
// console.log(str6.match(/(?<=昭和|平成)\d+/))

const str7 = "My name is Taro Suzuki and I am a researcher at ABC.";

console.log(str7.match(/\ba\w*\b/g));

var falseValue = new Boolean(false);
console.log(falseValue)//false



var fafa = null;
console.log(typeof fafa)//Object
console.log(fafa == undefined)//等値演算子ではtrueになってしまう
console.log(fafa === null);//true //同値演算子を使う
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