Nodejs Int Value Check isInt()

Here you can find the source of isInt()

Method Source Code

String.prototype.isInt = function() {
    if (this == "NaN")
        return false;
    return this == parseInt(this).toString();
}

Related

  1. isInteger()
    String.prototype.isInteger = function() {
      return (/\d/g).test(this);
    
  2. isInteger()
    String.prototype.isInteger = function()
      return (/^[-\+]?\d+$/.test(this.Trim()));
    
  3. isInteger(value, isString)
    Number.isInteger = function isInteger(value, isString) {
        if (typeof value === "string" && isString) {
            if (value.match(/^[+-]?\d*\.?\d+(?:[eE][+-]?\d+)?$/)) {
                return Number.isInteger(parseFloat(value, 10));
        return typeof value === "number" && isFinite(value) && Math.floor(value) === value;
    };