Arrays are used to store data at the continuous memory location. Many people encounter a general requirement to get a random value from an array in javascript. This article will discuss different ways to get a random value from an array using various examples.

*JavaScript’s **Math.random() **number gives a floating-point random number between 0 to less than 1 (0 is inclusive, but 1 is exclusive). This method does the initial work to generate random numbers between the desired range.*

We will be using * Math.random() *method to get a floating-point random value between 0 to less than 1, which we can further use to generate random numbers within the range 0 to the array’s length.

## Get Random Value from an Array using Math.random() and Math.floor()

*Javascript’s Math.floor() method returns the largest integer less than or equal to the specified number.*

**Example:-**

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*Get a random value from the array*** ****[“Harry”, “Fiona”, “Veronica”, “Sam”, “George”, “Will”]**

**Code:-**

//function to get the random value function getRandomValue(_array){ return _array[Math.floor(Math.random()*_array.length)]; } //usage of the function const myArray1 = ["Harry", "Fiona", "Veronica", "Sam", "George", "Will"]; console.log(getRandomValue(myArray1));

**Output:-**

Sam

**Explanation:-**

- Here, we created a
functionin the above code to get a random value from an array.*getRandomValue()* - The function takes an array as the input parameter and returns any random value from that array.
- Within the function, we get a
using**pseudo-random floating-point value between 0 to less than 1****Math.random().** - Then multiply this value with the length of the array to get any random floating-point value within range
.*0 to the array’s length* - Finally, apply
to get the*Math.floor()*.**largest integer value between 0 to the***array’s length* - This value is the
to get the corresponding array element.*index position* *FORMULA TO GET A RANDOM VALUE WITH A RANGE:*- Math.random() * (max – min + 1 ) + min
*In our case,*- Math.random() * (5-0+1)+0 = Math.random() * 6 = Math.random() * length of the array

*Similarly we can use any other integer array as well:*

//function to get the random value function getRandomValue(_array){ return _array[Math.floor(Math.random()*_array.length)]; } //usage of the function const myArray2 = [5,7,9,25,35]; console.log(getRandomValue(myArray2));

**Output:-**

7

***Note that the output can be different for each run as there can be any random value within the array.*

## Get Random Value from an Array using Math.random() and ~~

*Javascript’s **~~** operator coverts some of the other types to the integer type. Since it is faster, it is also used as a replacement to Math.floor()*

**Example:-**

*Get a random value from the array*** [“Harry”, “Fiona”, “Veronica”, “Sam”, “George”, “Will”]**

**Code:-**

//function to get the random value function getRandomValue(_array){ return _array[~~(Math.random() * _array.length)]; } //usage of the function const myArray1 = ["Harry", "Fiona", "Veronica", "Sam", "George", "Will"]; console.log(getRandomValue(myArray1));

**Output:-**

Veronica

**Explanation:-**

- The technique is the same as the above explanation, just that we are using ~~ rather than Math.floor() method.

*Similarly we can use any other integer array as well:*

//function to get the random value function getRandomValue(_array){ return _array[~~(Math.random()*_array.length)]; } //usage of the function const myArray2 = [5,7,9,25,35]; console.log(getRandomValue(myArray2));

**Output:-**

5

## Get Random Value from an Array using Math.random() and find()

*Javascript’s **find() **method** will return the first element from the array that satisfies the provided function.*

**Example:-**

*Get a random value from the array*** [“Harry”, “Fiona”, “Veronica”, “Sam”, “George”, “Will”]**

**Code:-**

//function to get the random value function getRandomValue(_array) { return _array.find(( p, i, arr) => Math.random() < 1 / (arr.length - i)); } //usage of the function const myArray1 = ["Harry", "Fiona", "Veronica", "Sam", "George", "Will"]; console.log(getRandomValue(myArray1));

**Output:-**

Fiona

**Explanation:-**

- Here, we are using the find() function, assuming that the probability of selecting one random value from n items is 1/n.

*I hope this article helped you get a random value in javascript. Good Luck !!!*

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