JS Get all PDFs links on a web page

var pdflinks = [];
Array.prototype.map.call(document.querySelectorAll("a[href$=\".pdf\"]"), function(e, i) {
    if ((pdflinks || []).indexOf(e.href) == -1) {
        pdflinks.push(e.href);
    }
});
console.log(pdflinks.join(" "));