如何使用slice方法从数组中获取随机元素并将其存储

Question

I have an array lets say array x = A,B,C,D,E

I want to use the slice function to take a random element from my array and store it for later use in a new var

so I get a new variable ie var y= x.slice

But I do not want to specify which element it takes from the array, I want it to be random each time how do I randomize the slice ?

Answer 1

use splice() to extract and remove an element from an array.

Use Math.random() to generate a random number from 0 to 1

multiply by the number of elements or length of the array

and trucate with Math.floor() the result to get a random index into the array.

var x = ['a','b','c','d']; 
var y = x.splice(Math.floor(Math.random()*x.length),1);

now, y contains the new array of the single element that has been extracted, and x contains the array of the remaining elements.

if instead of an array you just want the element returned, change that line to

var y = x.splice(Math.floor(Math.random()*x.length),1)[0];