part1.js

//Run this directly in the browser console for the input
var text = document.body.textContent.split('\n');
var checksums = [];
var answer = 0;
for (var i = 0; i < text.length; i++) {
    var curText = text[i];
    var cs = curText.match(/[^[\]]+(?=])/g);
    if (cs) {
        checksums.push(cs);
    }
    curText = curText.substring(0, curText.indexOf('\['));
    var testing = "";
    //worst way to do this but fuck it I'm tired
    getFrequency(curText).reverse().forEach(function(entry) {
        testing+=entry[0];
        // for (var i = 0; i < getFrequency(curText).length; i++) {
        // 	if(entry==getFrequency(curText)[i][0]){
        // 		console.log(getFrequency(curText)[i][0]);
        // 	}
        // }
    });

    // console.log(testing.substring(0,5));
    var finalString = testing.substring(0, 5).split('').sort().join('');
    if (cs==finalString) {
        console.log(finalString);
        console.log(cs[0]);
        answer+=Number(curText.split("-")[curText.split("-").length-1]);
    }
}

console.log(answer);

function getFrequency(string) {
    var freq = {};
    for (var i = 0; i < string.length; i++) {
        var character = string.charAt(i);
        if (character != "-") {
            if (freq[character]) {
                freq[character]++;
            } else {
                freq[character] = 1;
            }
        }
    }
    var sortable = [];
    for (var number in freq)
        sortable.push([number, freq[number]])

    sortable.sort(function(a, b) {
        return a[1] - b[1]
    })
    return sortable;
};