How to use the tlds.filter function in tlds
To help you get started, we’ve selected a few tlds examples, based on popular ways it is used in public projects.
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markdown-it / linkify-it / support / tlds_2char_gen.js View on Github 
for (i = 1; ; i++) {
if (str[i] !== String.fromCharCode(str[i - 1].charCodeAt(0) + 1)) {
if (i < 3) {
ranges.push(str.slice(0, i));
} else {
ranges.push(str[0] + '-' + str[i - 1]);
}
str = str.slice(i);
break;
}
}
}
return '[' + ranges.join('') + ']';
}
var tlds = require('tlds').filter(name => /^[a-z]{2}$/.test(name)).sort();
//
// group by first letter
//
var result = [];
'abcdefghijklmnopqrstuvwxyz'.split('').forEach(letter => {
var list = tlds.filter(name => name[0] === letter);
if (!list.length) { return; }
if (list.length < 2) {
result = result.concat(list);
return;
}
