Get a random value from array in JavaScript
Today, we will show you how to get a random value from array in JavaScript with example.
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Let’s start with an example so you can understand easily. To get a random value, we have to generate a random index number and return it. This is the simple method colors[Math.floor(Math.random() * colors.length)] to get a random value from array.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | var colors = [ 'Yellow', 'Blue', 'Pink', 'Red', 'Black', 'White', 'Green' ]; var color = colors[Math.floor(Math.random() * colors.length)]; console.log(color); // Output: Pink |
How it works:
First, Use the Math.random() function to get index of array that returns a random value between 0 and 1.
1 2 | var rand = Math.random(); // Output: 0.8517781809554954 |
Now, using the length property we can get the last index of array that is maximum number.
1 2 | var totalColors = colors.length; // Output: 7 |
Then multiply the random number with the length of the array and round down that result by Math.floor.
1 2 | var randIndex = Math.floor(Math.random() * colors.length); // Output: 2 |
Finally, using random index we can get a random value from array.
1 2 | var randColors = colors[Math.floor(Math.random() * colors.length)]; // Output: Pink |
If you run this code, you will see the random colour name every time.
That’s it for today. Happy Coding!
