check that something is a certain number of digits js code example

Example 1: javascript count digits

var length = (number + '').replace('.', '').replace('-', '').length;  // for numbers that can be floats or negatives

Example 2: get number right of the dot length javascript

var x = 23.453453453;
x.countDecimals(); // 9

var countDecimals = function (value) {
    if(Math.floor(value) === value) return 0;
    return value.toString().split(".")[1].length || 0; 
}