Onuwa Nnachi Isaac iamonuwa

Day 1

Read How to answer a coding interview.
Read Using sliding window technique to solve coding interview questions.
Practice coding Array 1 Two Sum
Practice coding Array 2 Three Sum
Practice coding Array 3 Max Consecutive Ones III
Practice coding Array 4 Maximum Product Subarray

Day 2

Read Using state machine to solve complex coding interview questions.

Group Array of JavaScript Objects by Keys or Property Values

This fork of JamieMason's implementation changes the key parameter to be an array of keys instead just a single key. This makes it possible to group by multiple properties instead of just one.

Implementation

const groupBy = keys => array =>
  array.reduce((objectsByKeyValue, obj) => {
    const value = keys.map(key => obj[key]).join('-');

Group Array of JavaScript Objects by Key or Property Value

Implementation

const groupBy = key => array =>
  array.reduce((objectsByKeyValue, obj) => {
    const value = obj[key];
    objectsByKeyValue[value] = (objectsByKeyValue[value] || []).concat(obj);
    return objectsByKeyValue;

	// SPDX-License-Identifier: MIT
	pragma solidity >=0.5.0 <0.8.0;

	import 'https://github.com/OpenZeppelin/openzeppelin-contracts/contracts/token/ERC20/ERC20.sol';
	import 'https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/Math.sol';


	contract ExampleToken is ERC20 {
	using SafeMath for uint256;

	<html>
	<head>
	<title>Torus</title>
	</head>
	<body>
	<script
	src="https://app.tor.us/v0.2.12/embed.min.js"
	integrity="sha384-lSiHcwUwWc+IymcuPXKXIJNrAdqA69cjnB7L8VWHlSI99WbNqzM3yLzQD/M9m2jq"
	crossorigin="anonymous"
	>

	const tx = await arweave.createTransaction(
	{ data: JSON.stringify(data) },
	key
	);

	console.log(tx);
	tx.addTag("App-Name", "demo");
	tx.addTag("App-Version", "0.0.1");
	tx.addTag("Unix-Time", Math.round(new Date().getTime() / 1000));
	tx.addTag("Type", "publish");

	<Input
	type="text"
	placeholder="Enter the number"
	onKeyDown={this.onKeyDown}
	/>

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