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// check version
node -v || node --version

// list installed versions of node (via nvm)
nvm ls

// install specific version of node
nvm install 6.9.2

// set default version of node

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Removing the last commit

To remove the last commit from git, you can simply run git reset --hard HEAD^ If you are removing multiple commits from the top, you can run git reset --hard HEAD~2 to remove the last two commits. You can increase the number to remove even more commits.

If you want to "uncommit" the commits, but keep the changes around for reworking, remove the "--hard": git reset HEAD^ which will evict the commits from the branch and from the index, but leave the working tree around.

If you want to save the commits on a new branch name, then run git branch newbranchname before doing the git reset.

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const returnsAPromise = (string) => (
  new Promise((resolve, reject) => {
    if (typeof string !== 'string') reject('Not a string!');
    resolve(`String is a resolved promise now: ${string}`);
  })
);

const myString = "Kait's string";
let isOurPromiseFinished = false;

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// spread operator examples

let a = [3, 4, 5];
let b = [1, 2, ...a, 6];
console.log(b);

function foo(a, b, c) { console.log(`a=${a}, b=${b}, c=${c}`)} 
let data = [5, 15, 2];
foo( ...data);

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// Array destructuring. Swap values

let param1 = 1;
let param2 = 2;

//swap and assign param1 & param2 each others values
[param1, param2] = [param2, param1];

console.log(param1); // 2
console.log(param2); // 1

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// sets

let arr = [1, 1, 2, 2, 3, 3];
let deduped = [...new Set(arr)] // [1, 2, 3]

console.log(deduped);

let mySet = new Set([1,2, 3, 4, 5]);
var filtered = [...mySet].filter((x) => x > 3) // [4, 5]

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// Destructuring nested object

var car = {
  model: 'bmw 2018',
  engine: {
    v6: true,
    turbo: true,
    vin: 12345
  }
}

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// Destructuring with rest parameter
let {_internal, tooBig, ...cleanObject} = {el1: '1', _internal:"secret", tooBig:{}, el2: '2', el3: '3'};
console.log(cleanObject); // {el1: '1', el2: '2', el3: '3'}

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var cars = ['BMW','Benz', 'Benz', 'Tesla', 'BMW', 'Toyota'];
var carsObj = cars.reduce(function (obj, name) { 
   obj[name] = obj[name] ? ++obj[name] : 1;
  return obj;
}, {});

console.log(carsObj);

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const numbers = [10, 20, 30, 40];

let updatedNumbers = numbers
                      .map((num) => num * 2)
                      .filter((num) => num > 50);

let doubledOver50 = numbers.reduce((finalList, num) => {
  num = num * 2; //double each number (i.e. map)
  //filter number > 50
  if (num > 50) {