Formatted logging and debug utils

D.js

var ERROR_CSS   = "background-color: #f44336; color: #B2DFDB;"
var WARN_CSS    = "background-color: #FDD835; color: #B2DFDB;"
var INFO_CSS    = "background-color: #BDBDBD; color: #B2DFDB;"
var DEBUG_CSS   = "background-color: #9575CD; color: #ECEFF1;"

var D = function () { this.console = console }

D.prototype.printStyledArgs = function(passedArgs, css, fn) {
 
    for (var i = 0; i < passedArgs.length; i++) {
        var arg = passedArgs[i]
        
        typeof arg == "string" ?
            this.console[fn || 'log']("%c" + arg, css) :
            this.console[fn || 'log'](arg)
    }
}

D.prototype.d = function () {
    this.printStyledArgs(arguments, DEBUG_CSS, 'debug')
}

D.prototype.w = function() {
    this.printStyledArgs(arguments, WARN_CSS, 'warn')
}

D.prototype.e = function() {
    this.printStyledArgs(arguments, ERROR_CSS, 'error')
}

D.prototype.i = function() {
    this.printStyledArgs(arguments, INFO_CSS, 'info')
}

D.prototype.functionsIn = function (object) {
    this.i("Functions in:", object)
    for (var k in object) {
        if (k instanceof Function)
            this.i(k)
    }
}

D.prototype.useAsConsole = function (consoleMock) {
    this.console = consoleMock
}

var d = new D()