math round in javascript

1//There are meny ways of rounding...
2Math.floor(5.5) //Answer 5, it alwas rounds down.
3Math.round(5.5) //Answer 6, it simpily rounds to the closest whole number.
4Math.ceil(5.5) //Answer 6, it alwas rounds up.
5
6//You can do more things too...
7Math.floor(5.57 * 10) / 10 //Answer 5.5, the number turns into 55.7, Then gets floored (55.0), Then gets divied, (5.5).

1var avg=10.55;
2console.log(Math.round(avg)); //Prints 11

1Math.round(3.14159 * 100) / 100  // 3.14
2
33.14159.toFixed(2);              // 3.14 returns a string
4parseFloat(3.14159.toFixed(2));  // 3.14 returns a number
5

1function round(num, places) {
2    num = parseFloat(num);
3    places = (places ? parseInt(places, 10) : 0)
4    if (places > 0) {
5        let length = places;
6        places = "1";
7        for (let i = 0; i < length; i++) {
8            places += "0";
9            places = parseInt(places, 10);
10        }
11    } else {
12        places = 1;
13    }
14    return Math.round((num + Number.EPSILON) * (1 * places)) / (1 * places)
15}
16
17round(1.005, 2); // 1.01
18round(1.005, "1"); // 1
19round("1.23", 1); // 1.2
20round("1.436", "2"); // 1.44

1// rounds the result to the closest integer
2//syntax Math.round(x);
3
4console.log(Math.round(0.9));
5// expected output: 1
6
7console.log(Math.round(5.95), Math.round(5.5), Math.round(5.05));
8// expected output: 6 6 5
9
10console.log(Math.round(-5.05), Math.round(-5.5), Math.round(-5.95));
11// expected output: -5 -5 -6

1let xo =7.45;
2xo = Math.round(xo);
3// output = 7;