๐พarr.randomElement
random element in array (undefined if array is empty)
- require: randomInt() 
// โญ๏ธ arr.randomElement
Object.defineProperty(Array.prototype, 'randomElement', {
    get() { return this[randomInt(this.length)] }
});
// โญ๏ธ randomElement(arr)
function randomElement(arr){
    return arr[randomInt(arr.length)];
}- arr.randomElement is a getter/setter. 
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