example.js

'use strict';

/* eslint-env node */

function sum(xs) { return xs.length === 0 ? 0 : xs[0] + sum (xs.slice (1)); }

const foo = x => y => z => [x, y, z];

if (parseInt ("foo 'bar' baz", 10) > 0) {
  console.log (1);
} else if (foo.bar == null) {
  console.log (2);
} else {
  console.log (3);
}

const epoch = new Date ('1970-01-01T00:00:00.000Z');
if ((foo.bar = {baz: 'baz'})) console.log (epoch);
else console.log (sum (foo (123) (456) (789)));

foo (123)
    (456)
    (789);

foo
  (123)
  (456)
  (789);

foo
.bar
.baz
.toUpperCase ()
.replace (/^/, '[')
.concat (']');

foo
  .bar
  .baz
  .toUpperCase ()
  .replace (/^/, '[')
  .concat (']');

((foo.bar.baz.toUpperCase ()).replace (/^/, '[')).concat (']');

let baz = foo.bar.baz;

baz =
  baz === 'foo' ? 1 :
  baz === 'bar' ? 2 :
  /* otherwise */ 3;

baz -= 1;
baz += 1;

baz = (baz => {
  switch (baz) {
    case 1: return 'foo';
    case 2: return 'bar';
    case 3: return 'baz';
  }
}) (baz);

console.log (
  baz !== 'baz' ? Math.abs :
  /x/.test ('') ? Math.sin :
  /* otherwise */ Math.cos
);

console.log (['foo',
              'bar',
              'baz']);

console.log ({foo: 1,
              bar: 2,
              baz: 3});

console.log ({
  abc: 0,
  var: 0,
  ['XYZ'.toLowerCase ()]: 0,
});

const rules = {
  'semi': [
    'error',
    'always',
    {omitLastInOneLineBlock: false},
  ],
  'semi-spacing': [
    'error',
    {before: false, after: true},
  ],
  'semi-style': [
    'error',
    'last',
  ],
};

console.log (rules['semi']);
console.log (rules['semi-spacing']);
console.log (rules['semi-style']);