Find the most repetitive letter

find_the_most_repetitive_letter_nodejs.js

const value1 = "Hello World!";
var data = [];



for(var i in value1){
    if(value1[i]!=" ")  data.push(value1[i]);
}

var build = [];

for(var i in data){
    var tmp_counter = 0;
    for(var i_ in value1){
        if(data[i]==value1[i_]) tmp_counter++
    }
    build.push(tmp_counter);
}

indexes = [];

for(var i in build){
    if(build[i]==Math.max.apply(Math, build))    indexes.push(i);
    
}

var outs = [];

for(i in indexes){
    var proc_index = indexes[i];
    console.log();
    if(!outs.includes(data[proc_index]))outs.push(data[proc_index]);
}

console.log(outs.toString());