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CSS

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Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

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JavaScript

Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

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Code Indentation

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HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              
            
          
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CSS

            
              
            
          
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JS

            
              const p1 = () => {
	return new Promise((resolve) => {
		setTimeout(() => {
			output("Run p1", true)
			resolve(10);
		}, 1000);
	});
};

//引数を倍増して2秒後に値を返すプロミス
const p2 = (d) => {
	return new Promise((resolve) => {
		setTimeout(() => {
			output("Run p2", true)
			resolve(d * 2);
		}, 2000);
	});
};

//引数に2を足して1秒後に値を返すプロミス
const p3 = (d) => {
	return new Promise((resolve) => {
		setTimeout(() => {
			output("Run p3", true)
			resolve(d + 2);
		}, 1000);
	});
};

const  arrayPromise = [ p1, p2, p3 ];

//プロミスを同期処理するreducer		
async function chain(acc, cur, i) {
	const obj = await acc; //解決済みプロミスを蓄積する
	const val = await cur(obj.sum).then((d) => d); //戻り値を抽出
	return { ...obj, sum: val };
}

//初期値として空の解決済みプロミスオブジェクトを指定する
var result = arrayPromise.reduce(chain, Promise.resolve({}));
	
result.then((result) =>{
	output(result)
});


//画面出力
function output(str, flag){
  if(typeof str == 'object') {
    str = JSON.stringify(str,null,"\t");
  }

  if(!flag) str = "> " + str;

  var dom = document.querySelector("body")
  var txt = dom.innerText;
  dom.innerText =  txt + str + "\n"
}
            
          
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999px

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