Find how many decimal places a number has. Also please note that I usually start coding these gists as Chrome Snippets so that's why they all are functions attached to window. You don't need to do that

findDecimal.js

(function(){
    
    window.findDecimal = function(x){
        if (typeof x === 'string') {
            var x_str = parseFloat(x);
        } else if (typeof x === 'number') {
            var x_str = x.toString();
        } else {
            return false; //not a string or a number
        }        

        var decimal_digits = x_str.length - x_str.lastIndexOf('.') - 1;
        decimal_digits === x_str.length && (decimal_digits = 0); // case no decimal
        return decimal_digits;
    }   
    
})()