Nodejs Number Value Check isNumeric()

Method Source Code

/**//from   w  w  w  . j a v  a 2  s . c om
@Name: String.prototype.isNumeric
@Author: Paul Visco
@Version: 1.1 11/27/07
@Description: Checks to see if a string is numeric (a float or number)
@Return: Boolean True if the the string represnts numeric data, false otherwise
@Example:
var str = '12';

var answer = str.isNumeric();
//answer = true
*/
String.prototype.isNumeric = function() {
  return !isNaN(parseFloat(this)) && isFinite(this);
};

Related

1. isNumber()

   String.prototype.isNumber = function (){
       var str = this;
       return !isNaN(str);
   

2. isNumber()

   String.prototype.isNumber = function()
     return (/^\d+$/.test(this.Trim()));
   

3. isNumber()

   String.prototype.isNumber = function()
     try
       var value = this.toString();
       value = value.replace(",","");
         if (parseFloat(value)!= value)
           return false;
         else
   ...
   

4. isNumeric()

   String.prototype.isNumeric = function(){
       return !isNaN(parseFloat(this)) && isFinite(this);
   

5. isNumeric()

   String.prototype.isNumeric = function() {
     return !isNaN(parseFloat(this)) && isFinite(this);
   };
   

6. isNumeric()

   String.prototype.isNumeric = function() {
       var tmpFloat = parseFloat(this);
       if (isNaN(tmpFloat))
           return false;
       var tmpLen = this.length - tmpFloat.toString().length;
       return tmpFloat + "0".Repeat(tmpLen) == this;
   

7. isNumeric()

   var postfixStack = new Array
   String.prototype.isNumeric = function() {
       return !isNaN(parseFloat(this)) && isFinite(this);
   function MathSolver() {
   this.infixToPostfix = function(infix) {
    for(var i = 0; i < infix.length; i++) {
               var token = infix[i];
               if(token.isNumeric()) {
   ...
   

8. isNumeric(iLoc)

   String.prototype.isNumeric = function (iLoc) {
       iLoc = ((!!iLoc) ? iLoc : 0);
       iLoc = ((iLoc < 0) ? 0 : iLoc);
       iLoc = ((iLoc > (this.length - 1)) ? this.length : iLoc);
       var _ch = this.substr(iLoc, 1);
       var b = ( (_ch >= '0') && (_ch <= '9') );
       return b;
   

9. isNumeric(value, isString)

   Number.isNumeric = function isNumeric(value, isString) {
       if (typeof value === "string" && isString) {
           return Number.isInteger(value, true) || Number.isFloat(value, true);
       return Number.isInteger(value) || Number.isFloat(value);
   };