basic hs templating using String object and Regex

supplant.js

if (typeof String.prototype.supplant !== 'function') {
    String.prototype.supplant = function (o) { 
        return this.replace(/{([^{}]*)}/g, 
            function (a, b) {  
                var r = o[b];
                return typeof r === 'string' ? r : a; 
            }); 
    };
}

/** 
usage: 

mydiv.innerHTML = template.supplant(data);
var template = '<table border="{border}">' +
    '<tr><th>Last</th><td>{last}</td></tr>' +
    '<tr><th>First</th><td>{first}</td></tr>' +
    '</table>';
    
var data = {
    first: "Carl", 
    last: "Hollywood", 
    border: 2
};

*/

// variations

var reSupplant = /{([^{}]*)}/g;
	
function supplant( string, obj ) {
   return string.replace(reSupplant, 
            function (a, b) {
                var r = obj[b];
                return typeof r === 'string' ? r : a; 
            });
}
		
function trim(stuff) {
    if (''.trim) 
		return stuff.trim();
    else 
		return s.replace(/^\s+/, '').replace(/\s+$/, '');
}