javascript round

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
6Math.round(3.14159)  // 3
7Math.round(3.5)      // 4
8Math.floor(3.8)      // 3
9Math.ceil(3.2)       // 4

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

1let x = 2.960024578;
2let res = x.toFixed(2);
3console.log(res);
4//2,96

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