Yogesh Chauhan's Blog

# How to Sort (Shuffle) an Array in Random Order in JavaScript?

in JavaScript on August 12, 2020

#### Solution 1

``````
var points = [40, 100, 1, 5, 25, 10];
points.sort(function(a, b){return 0.5 - Math.random()});
// [ 1, 100, 40, 10, 25, 5 ]

points.sort(function(a, b){return 0.5 - Math.random()});
// [ 5, 1, 25, 100, 10, 40 ]

...
...``````

#### Solution 2

``````
var points = [40, 100, 1, 5, 25, 10];
var i, j, k;
for (i = points.length - 1; i > 0; i--) {
j = Math.floor(Math.random() * i);
k = points[i];
points[i] = points[j];
points[j] = k;
}
console.log(points);
// [ 10, 40, 100, 1, 5, 25 ]

console.log(points);
// [ 10, 40, 25, 100, 5, 1 ]

...
...``````

Make a function..

``````
var points = [40, 100, 1, 5, 25, 10];
function myFunction() {
var i, j, k;
for (i = points.length -1; i > 0; i--) {
j = Math.floor(Math.random() * i)
k = points[i]
points[i] = points[j]
points[j] = k
}
console.log(points) ;
}
myFunction();
// [ 10, 5, 25, 1, 40, 100 ]

myFunction();
// [ 1, 25, 100, 10, 5, 40 ]``````

#### Solution 3

``````
function shuffle(array) {
var currentIndex = array.length, temporaryValue, randomIndex
// While there remain elements to shuffle...
while (0 !== currentIndex) {
// Pick a remaining element...
randomIndex = Math.floor(Math.random() * currentIndex);
currentIndex -= 1;
// And swap it with the current element.
temporaryValue = array[currentIndex];
array[currentIndex] = array[randomIndex];
array[randomIndex] = temporaryValue;
}
return array;
}

var points = [40, 100, 1, 5, 25, 10];
shuffle(points);

console.log(points);
// [ 40, 100, 5, 10, 1, 25 ]

console.log(points);
[ 40, 1, 5, 10, 100, 25 ]``````

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