{{# and([EXPRESSION...]) }} TRUTHY {{else}} FALSY {{/ and }}

and( x, y ) works just like x && y. You can use it directly within a magic tag like:

import {stache} from "can";

var view = stache(`{{# and(this.x, this.y) }} YES {{else}} NO {{/ and }}`);

var fragment = view({ x: 1, y: true});
console.log(fragment.firstChild.nodeValue) //-> YES
document.body.append(fragment);

You can use and in a nested expression like:

{{# if( and(this.x, this.y) ) }} YES {{else}} NO {{/ and }}

and also takes multiple arguments. and( x, y, z ) works just like x && y && z.