JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="number" /> 
<input type="text" id="secret" />

JavaScript

var ranges = {'range1':{min:-1000,max:2},'range2':{min:3,max:10},'range3':{min:11,max:1000}};

$('#number').keyup(findRange);

function findRange(){
    var num = parseInt( $('#number').val() );
    $('#secret').val('');
    for(rng in ranges)
    {
        if (num >= ranges[rng].min && num <=ranges[rng].max)
        {
            $('#secret').val(rng);
        }
    }
}