CODEWITHSUNDEEP
javascriptarraysrandom
user9715652
user9715652

Reputation:

Random Array with min/max

I need to create a two arrays. One with 24 random numbers between 5 and 20. The second with 24 random numbers between 1 and 10. I think I'm on the right track with creating the arrays but can't get the minimum of 5 & 1 to stick. Here's my code:

    function getRandomNumber(min, max)
{
  return Math.floor(Math.random() * max) + min;
}

var volts = [];
var amps = [];


for(var i = 0; i < 24; i++) {
  volts.push(getRandomNumber(5, 20));
}

for(var i = 0; i < 24; i++) {
  amps.push(getRandomNumber(1, 10));
}

var power = 0;
for(var i=0; i < volts.length; i++){
  power = (volts[i]*amps[i]);
}

console.log(volts);
console.log(amps);
console.log(power);

How would I add a third loop that performs an equation of volts multiplied by amps? Each iteration would multiply the random elements produced by each array

Upvotes: 0

Views: 799

Answers (3)

Oleksandr Bilenko
Oleksandr Bilenko

Reputation: 1

function getRandomArray(length, min, max){

    let arr = [];

    for (let i = 0; i < length; i++){
        arr.push((Math.random() * (max - min) + min).toFixed());;
    }
    return arr;
}

console.log(getRandomArray(24, 5, 20));

Upvotes: 0

losik123
losik123

Reputation: 590

Solution:

function getRandomNumber(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

var volts = [];
var amps = [];

for(var i = 0; i < 24; i++) {
  volts.push(getRandomNumber(5, 20);
}

for(var i = 0; i < 24; i++) {
  amps.push(getRandomNumber(1, 10);
}

console.log(volts);
console.log(amps);

Also in case you would like to use ES6 you can try this code:

function getRandomNumber(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

const volts = Array.from({length: 24}, () => getRandomNumber(5, 20);
const amps = Array.from({length: 24}, () => getRandomNumber(1, 10);

console.log(volts);
console.log(amps);

UPDATE [06/09/2018]

If you need to multiply these two arrays you could just create a third loop:

result = [];
for(var i = 0; i < 24; i++) {
  result.push(amps[i] * volts[i]);
} 
console.log(result)

Upvotes: 0

Luca Kiebel
Luca Kiebel

Reputation: 10096

To get a min/max random number between 5 and 20, you'd use Math.floor(Math.random() * (20 - 5 + 1)) + 5, from the MDN docs:

// Returns a random integer between min (include) and max (include)

Math.floor(Math.random() * (max - min + 1)) + min;

You can then use Array.from to create the array smoothly:

function randomBetween(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

let volts = Array.from({length: 24}, () => randomBetween(5, 20));
let amps = Array.from({length: 24}, () => randomBetween(1, 10));

console.log(volts, amps);

Upvotes: 1

Related Questions