JavaScript round() method implementation

Took 5 minutes and 12 seconds to code JavaScript round() method. Here is the code snippet.

Code:

function floor(num) {

x = num;

x = x - x % 1;

return x;

}

function ceil(num) {

x = num;

x = x - x % 1;

x = x + 1;

return x;

}

function round(num) {

x = num;

if (x % 1 >= 0.5) {

ceil(x)

} else {

floor(x);

}

return x;

}

document.write(round(4.5));

Result:

5