JS/TS

Runtime

• Deno
• Node
• V8
• Bun
• Cloud
  • Cloudflare Worker
  • Vercel Edge Runtime

Modules

Runtime	Name	Keywork
Node.js	CommonJS	require/exports/module.exports
Node.js/Browser	ES Modules	import/export default

Job Control

Sequence

Condition

Loop

for (var i=0;i<length;i++){
  console.log(i);
}

const array = ["one", "two", "three"]
array.forEach(function (item, index) {
  console.log(item, index);
});

let colors = ['red', 'green', 'blue'];
for (const color of colors){
    console.log(color);
}

Browser

• XMLHttpRequest

    var url = 'https://example.com';
    var xhr = new XMLHttpRequest();
    xhr.withCredentials = true;
    xhr.open('GET', url);
    xhr.setRequestHeader('Header','Value');
    xhr.send('Data');

• fetch

    var url = 'https://example.com';
    fetch(url,{
        "method": "POST",
        "headers": {
                "accept": "-/-"
        },
        "body": "body data",
        "mode": "cors",
        "credentials": "include"
    })

• fetch console.log headers

  fetch('https://example.com').then(response => { console.log(response.headers)]})

• fetch console.log response

  fetch('https://example.com').then(response => response.text())
    .then(json => {
        console.log(json);
  })

• cors checker

  fetch("https://example.com",{
      "method": "POST",
      "headers": {
          "accept": "-/-",
          "Access-Control-Allow-Origin": "example.com"
      },
      "body": "body data",
      "mode": "cors",
      "credentials": "include"
  })

NodeJS

TypeScript