How to convert number string in an array to number in JavaScript?

Question

I want to use Fisher Yates shuffle algorithm to shuffle each integer from Math.random()after the ". (dot)". I split them into string and use the Fisher Yates shuffle algorithm but I am stuck on how to convert it back to number.

From: ["0", ".", "4", "1", "2", "7", "2", "9", "5", "8", "6", "7", "0", "7", "4", "2", "8", "1"]

To: 0.4127295867074281

    var randomNum = Math.random();
    var stringNum = randomNum.toString();
    var stringArray = stringNum.split("");

    var i = stringArray;
    var j;
    var temp;

    while (--i > 1) {
        j = Math.floor(Math.random() * (i + 1));
        temp = stringArray[j];
        stringArray[j] = stringArray[i];
        stringArray[i] = temp;
    }

If you can't trust your RNG to give you a random number, how can you trust your RNG to shuffle your random number. — psaxton
– psaxton, Commented Mar 12, 2016 at 2:14

Ammar Hasan · Accepted Answer · 2016-03-12 01:40:52Z

3

First join the array and then cast to number Number(strArray.join(""))

var strArray = ["0", ".", "4", "1", "2", "7", "2", "9", "5", "8", "6", "7", "0", "7", "4", "2", "8", "1"];

var num = Number(strArray.join(""));

// this prints 0.4127295867074281
document.write(num);

answered Mar 12, 2016 at 1:40

Ammar Hasan

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2 Comments

Ammar Hasan Over a year ago

Glad that it helped :)

Ammar Hasan Over a year ago

You can also use String(randomNum) instead of randomNum.toString();

obe · Accepted Answer · 2016-03-12 01:33:21Z

3

var str = "42";
var num = str * 1;

For the full number:

var fullNum = stringArray.join("") * 1

answered Mar 12, 2016 at 1:33

obe

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Comments

failpractice · Accepted Answer · 2016-03-12 02:10:29Z

0

I'm amazing with logic, but not so much with each language but here is a basic, idea in logic. Remember below I am concatenating

x = 0 y = 0

while( y > 10)

z = generate random number greater that 0 and less than 10;

x = "x" + "." + "z"

end

answer = x

answer = answer + x

edited Mar 12, 2016 at 2:10

answered Mar 12, 2016 at 2:01

failpractice

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