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const combine = (...arrays)
=> [].concat(...arrays);
const compact = arr
=> arr.filter(el => el);
const contains = (() => Array.prototype.includes
? (arr, value) => arr.includes(value)
: (arr, value) => arr.some(el => el === value)
)();
var myScript = document.createElement('script');
myScript.src = 'http://code.jquery.com/jquery-2.1.4.min.js';
myScript.onload = function() {
console.log('jQuery loaded.');
};
document.body.appendChild(myScript);