Станислав Некрасов

const mustStay = arr => arr.every(n => n.value !== '-');

const newArr = arr.filter(mustStay);

// или

const newArr = [];
for (const n of arr) {
  if (mustStay(n)) {
    newArr.push(n);
  }
}

// или

const newArr = [];
for (let i = 0; i < arr.length; i++) {
  if (mustStay(arr[i])) {
    newArr[newArr.length] = arr[i];
  }
}

// или

const newArr = (function get(i, n = arr[i]) {
  return n
    ? [ mustStay(n) ? [ n ] : [], get(i + 1) ].flat()
    : [];
})(0)

for (let i = 0; i < arr.length; i++) {
  if (!mustStay(arr[i])) {
    for (let j = i--; ++j < arr.length; arr[j - 1] = arr[j]) ;
    arr.pop();
  }
}

// или

arr.reduceRight((_, n, i, a) => mustStay(n) || a.splice(i, 1), null);

// или

arr.splice(0, arr.length, ...arr.filter(mustStay));

// или

arr.length -= arr.reduce((acc, n, i, a) => (
  a[i - acc] = n,
  acc + !mustStay(n)
), 0);

if (
  document.getElementById('apple').style.display == 'none' &&
  document.getElementById('shoe').style.display == 'none' &&
  document.getElementById('book').style.display == 'none' &&
  document.getElementById('purse').style.display == 'none'
) {
   document.getElementById('begin').style.display = 'none';
}

let sections = 'http://mysite.com/category/post/'.split('/');
let lastSection = sections.pop() || sections.pop();

let sections = 'http://mysite.com/category/post/'.split('/').filter(x => x.length > 0);
let last = sections.pop();

class A:
    pass

a = A()
a.x = 1
print(a.x, a.__getattribute__('x'))

a.__setattr__('from', 2) #  вот же идиотизм
print(a.__getattribute__('from'))

while True:
    s = input("набери уже чтонибудь")
    print(s)

from datetime import *
now = datetime.now()
while True:
	x = input('Введите комманду: ')
	if x == 'Now':
		print (now)
	# Всё дело в отступах :)

const objectParser = (data, path = '') =>
  Object.assign(
    { [path || '<root>']: data },
    ...(data instanceof Object
      ? Object.entries(data).map(([ k, v ]) => objectParser(v, `${path}[${k}]`))
      : []
    )
  );

function objectParser(data) {
  const result = {};

  for (const stack = [ [ data, '' ] ]; stack.length;) {
    const [ n, path ] = stack.pop();
    result[path || '<root>'] = n;
    (n instanceof Object) && Object
      .entries(n)
      .reverse()
      .forEach(([ k, v ]) => stack.push([ v, `${path}[${k}]` ]));
  }

  return result;
}

if (typeof defaultBg1 == 'Background') // ???

if (defaultBg1 instanceof Background)
// или
if (defaultBg1.constructor === Background)
// или
if (defaultBg1.constructor.name === 'Background')

const type = x => x == null ? `${x}` : x.constructor.name;

type() // 'undefined'
type(null) // 'null'
type(true) // 'Boolean'
type(69) // 'Number'
type('hello, world!!') // 'String'
type(/./) // 'RegExp'
type([ 187 ]) // 'Array'
type({ z: 666 }) // 'Object'
type(document) // 'HTMLDocument'
type(document.querySelectorAll('div')) // 'NodeList'
type(new class XXX {}) // 'XXX'
type(type) // 'Function'

document.getElementById('acting').onclick = function() {
  document.getElementById('zakaz').setAttribute('action', '/zakaz.php');
}