Nodejs Int Value Check isInteger()

Here you can find the source of isInteger()

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  5. isInteger()

Method Source Code

String.prototype.isInteger = function() {
   return (/\d/g).test(this);
}

Related

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