gistfile1.js

function SomeViewModel(title){
	this.title = data(title)
		.map(toLowerCase);

	this.description = event(node, 'change')
		.map(getTargetValue)
		.filter(Boolean);

	this.full = computed(interpolate('$0: $1'), [this.title, this.description]);
}

function SomeViewModel(title){
	this.title = data(title)
		.bind(map(toLowerCase));

	this.description = event(node, 'change')
		.bind(map(getTargetValue))
		.bind(filter(Boolean));

	this.full = computed(interpolate('$0: $1'), [this.title, this.description]);
}

function SomeViewModel(title){
	this.title = data(title)
		.bind(toLowerCase());

	this.description = event(node, 'change')
		.bind(getTargetValue())
		.bind(isDefined());

	this.full = computed(interpolate('$0: $1'), [this.title, this.description]);
}