My goal is to choose a random element from an Array and then remove it, repeating this process until the Array is empty.
I have experimented with the .filter() function and Math.random without success. I also attempted to implement it within a for loop, but none of my attempts were fruitful.
let weekdays = ['monday', 'tuesday', 'wednesday', 'thursday', 'friday'];
const index = Math.floor(Math.random() * weekdays.length);
console.log(weekdays[index]); //displays the random day
let selectedDay = weekdays[index]
weekdays = weekdays.filter(function(day) {
return day !== selectedDay
})
console.log(weekdays); //prints the array after removing the selected dayIf you want to get a random element from an array, you can generate a random index each time and use the Array#splice method.
const arr = [1, 2, 3, 4];
function getRandomElement(){
return arr.splice(Math.random() * arr.length | 0, 1)[0];
}
console.log(getRandomElement());
console.log(arr);However, for your specific use case, it might be more efficient to shuffle the array and then iterate through it. The Fisher-Yates shuffle algorithm is one way to achieve this.
const arr = [1, 2, 3, 4];
for(let i = arr.length - 1; i > 0; i--){
const j = Math.random() * (i + 1) | 0;
[arr[i], arr[j]] = [arr[j], arr[i]];
}
for(const element of arr) console.log(element);The use of .filter() results in the creation of a fresh array rather than altering the original one.
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