example of promise in the MetaMask API

MetaMask_docs_promise.js

params: [
    {
      from: '0xb60e8dd61c5d32be8058bb8eb970870f07233155',
      to: '0xd46e8dd67c5d32be8058bb8eb970870f07244567',
      gas: '0x76c0', // 30400
      gasPrice: '0x9184e72a000', // 10000000000000
      value: '0x9184e72a', // 2441406250
      data:
        '0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675',
    },
  ];
  
  ethereum
    .request({
      method: 'eth_sendTransaction',
      params,
    })
    .then((result) => {
      // The result varies by RPC method.
      // For example, this method will return a transaction hash hexadecimal string on success.
    })
    .catch((error) => {
      // If the request fails, the Promise will reject with an error.
    });