Format Integer to Price with Space (usefull for rubles)

integerToPrice.js

// Price Format
function formatNum(num){
    var num = num + '',
        arr = num.split(''),
        arrCopy = arr.slice(0),
        j = 0;
    for(var i = arr.length -1 ; i >= 0; i--){
        if ( j % 3 === 0 && j !== 0 ) {
            arrCopy.splice( i + 1, 0, ' ' );
        }
        j++;
    };
    return arrCopy.join('');
};