Math function that is self-reflective

exp.html

<script src="exp.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript" charset="utf-8">
	// alert(ALL.plus(1).minus(5).dividedBy(2).times(1000));
	alert(ALL.equals(2).toThePowerOf(2).dividedBy(2).plus(100).plus(234).times(3).dividedBy(5));
	alert(ALL.getLog());
	// alert(typeof ALL.getLog)
</script>

exp.js

var ALL = {
	value: 0,
	log: [],
	_log: function(op,n) {
		this.log.push(op + ' ' + n + ' = ' + this.value);
	},
	_numberize: function(n) {
		return parseFloat(n);
	},
	equals: function(n) {
		this.value = this._numberize(n);
		this._log('equals',n);
		return this;
	},
	plus: function(n) {
		this.value+=this._numberize(n);
		this._log('plus',n);
		return this;
	}, 
	minus: function(n) {
		this.value-=this._numberize(n);
		this._log('minus',n);
		return this;
	},
	dividedBy: function(n) {
		n = this._numberize(n);
		this.value = (n == 0) ? 'infinity' : this.value /= n;
		this._log('dividedBy',n);
		return this;
	},
	times: function(n) {
		this.value*=this._numberize(n);
		this._log('times',n);
		return this;
	},
	toThePowerOf: function(n) {
		this.value = Math.pow(this.value, this._numberize(n));
		this._log('toThePowerOf',n);
		return this;
	},
	toString: function() {
		return ''+this.value;
	},
	getLog: function() {
		return this.log.join('\n');
	}

}