functions.js

/**
 * Functions
 */

var x = function(arg1, arg2) {
  return arg1 * arg2;
};

var x = (arg1, arg2) => arg1 * arg2;

ifElse.js

/**
 * If / else
 */

function multiliner() {
  if ('orange' == 'pineapple') {
    return 'wow';
  } if else ('orange' == 'banana') {
    return 'baww';
  } else {
    return 'naww';
  }
}

function oneliner() {
  if ('orange' == 'pineapple') return 'wow';
  if ('orange' == 'banana') return 'bawww';
  return 'naww';
}

valueAssignment.js

/**
 * Value assignment
 */

if (var x == 'potato') {
  var y = 'french fries'
} else if (var x == 'dog') {
  var y == 'wok n walk';
} else {
  var y == 'buffalo bill';
}

var y = 'buffalo' == x ? 'french fries'
  : 'dog' == x ? 'wok n walk'
  : 'buffalo bill'