Element.fillWith basic "template filling" function

element.fillWith.js

/**
 * replaces variables in element innerHTML, e.g.
 * DOM: <span id="fillMe">hey {{#}}, whats up {{#}}</span>
 * Code: document.querySelector('#fillMe').fillWith('bro')
 * Output: hey bro, whats up bro
 *
 * DOM: <span id="fillMe">the {{animal}} is sitting at the {{forniture}}</span>
 * Code: document.querySelector('#fillMe').fillWith({'animal': 'cat', 'forniture': 'table'});
 * Output: the cat is sitting at the table
 */
Element.prototype.fillWith = function(data) {
    var content = this.innerHTML;
    if (typeof data !== 'object') {
        data = {'#': data};
    }
    Object.keys(data).forEach(function(k) {
        var exp = new RegExp('\{\{' + k + '\}\}', 'g');
        content = content.replace(exp, data[k]);
    });
    this.innerHTML = content;
    return this;
};