Format a number to two decimal places

Question

Give me a native (no jQuery, Prototype, etc. please) JavaScript function that converts numbers as follows:

input:  0.39, 2.5,  4.25, 5.5,  6.75, 7.75, 8.5
outpu         


        

Answer 1

You can use the toFixed() method on Number objects:

var array = [0.39, 2.5,  4.25, 5.5,  6.75, 7.75, 8.5], new_array = [];
for(var i = 0, j = array.length; i < j; i++) {
    if(typeof array[i] !== 'number') continue;
    new_array.push(array[i].toFixed(2));
}

Answer 2

input = 0.3;
output = input.toFixed(2);
//output: 0.30