require.js

var fs = require('fs');
var js = fs.readFileSync('small.js', 'utf-8');

// performance:
// 10mb of code - 50ms

function find(js) {
    var skipBlocks = [];
    var k = 0;
    js = js + '\n';
    for (var i = 0; i < js.length; i++) {
        var code = js.charCodeAt(i);
        if (code === 47) {
            var nextcode = js.charCodeAt(++i);
            if (nextcode === 42) {
                var start = i - 1;
                while (nextcode = js.charCodeAt(++i)) {
                    if (nextcode === 42) {
                        if (js.charCodeAt(i + 1) === 47) {
                            i++;
                            skipBlocks[k] = start;
                            k++;
                            skipBlocks[k] = i + 1;
                            k++;
                            break;
                        }
                    }
                }
            } else if (nextcode === 47 && js.charCodeAt(i - 1) !== 92) {
                start = i - 1;
                while (nextcode = js.charCodeAt(++i)) {
                    if (nextcode === 10) {
                        skipBlocks[k] = start;
                        k++;
                        skipBlocks[k] = i + 1;
                        k++;
                        break;
                    }
                }
            }
        } else if (code === 34 || code === 39) {
            start = i;
            while (nextcode = js.charCodeAt(++i)) {
                if (nextcode === 92) {
                    i++;
                    continue;
                }
                if (nextcode === code) {
                    skipBlocks[k] = start;
                    k++;
                    skipBlocks[k] = i + 1;
                    k++;
                    break;
                }
            }
        }
    }
    // var comments = js.match(/\/\*[\s\S]*\*\//g);
    // var lineComments = js.match(/\/\/.*\n/g);
    // var strings = js.match(/(?=["'])(?:"[^"\\]*(?:\\[\s\S][^"\\]*)*"|'[^'\\]*(?:\\[\s\S][^'\\]*)*')/g);
    // var requres = js.match(/_dereq_\(\s*["']?(.*?)["']?\s*\)/g);
    return skipBlocks;
}

var hot = '/*1*/ //1 \n"1" \'a\'';
for (let i = 0; i < 500; i++) {
    var res = find(hot);
}
for (let i = 0; i < 10; i++) {
    console.time('perf');
    var res = find(js);
    console.timeEnd('perf');
}

console.log(res.length);

for (let i = 0; i < res.length; i += 2) {
    // console.log('------', hot.substring(res[i], res[i + 1]));
}