[SOLVED] Creating a Fixed-Length Queue Array in Javascript

Creating a Fixed-Length Queue Array in Javascript

I know this is a basic question, I have limited knowledge in JS. Is there an alternative method to keep an array length fixed with queue feature. The array keep receiving data I want always to remove the first element of the array?

var a=Math.random;
var array=[];

if (array.length < 4) {
array.push(a);
} else {
array.shift();
}
console.log("array",array);

I was hoping if there is such thing as following:

var a=Math.random;
var array=[];
array.length=4
array.push(a);
console.log(array);

Solution

You've basically got it in your first code block there, it just requires a slight adjustment of the logic. If it's a queue then you should always push the new number. You should then test if the length is greater than 4, and if it is, then use .shift() as you have done here to remove the first element.