Showing posts with label rounding ceil. Show all posts
Showing posts with label rounding ceil. Show all posts

Saturday, December 13, 2014

jQuery rounding number to nearest, flooring or ceiling as expected decimal point


function roundNumber(value, exp) {
    return decimalAdjust('round', value, exp);
}

function floorNumber(value, exp) {
    return decimalAdjust('floor', value, exp);
}

function ceilNumber(value, exp) {
    return decimalAdjust('ceil', value, exp);
}

function decimalAdjust(type, value, exp) {
    // If the exp is undefined or zero...
    if (typeof exp === 'undefined' || +exp === 0) {
        return Math[type](value);
    }
    value = +value;
    exp = +exp;
    // If the value is not a number or the exp is not an integer...
    if (isNaN(value) || !(typeof exp === 'number' && exp % 1 === 0)) {
        return NaN;
    }
    // Shift
    value = value.toString().split('e');
    value = Math[type](+(value[0] + 'e' + (value[1] ? (+value[1] - exp) : -exp)));
    // Shift back
    value = value.toString().split('e');
    return +(value[0] + 'e' + (value[1] ? (+value[1] + exp) : exp));
}