js check if string or int

// native returns true if the variable does NOT contain a valid number
isNaN(num)

// can be wrapped for making simple and readable
function isNumeric(num){
  return !isNaN(num)
}

isNumeric(123)         // true
isNumeric('123')       // true
isNumeric('1e10000')   // true (This translates to Infinity, which is a number)
isNumeric('foo')       // false
isNumeric('10px')      // false

4.5
4
A10ciod 105 points

                                    if (typeof myVar === 'string'){<br/>    //I am indeed a string<br/>}

4.5 (4 Votes)
0
4
2
Yarzar 90 points

                                    function isInt(str) {
  return !isNaN(str) &amp;&amp; Number.isInteger(parseFloat(str));
}

4 (2 Votes)
0
4.5
4
K. Fryer 100 points

                                    function isNumber(n) { return /^-?[\d.]+(?:e-?\d+)?$/.test(n); } 

------------------------

isNumber('123'); // true  
isNumber('123abc'); // false  
isNumber(5); // true  
isNumber('q345'); // false
isNumber(null); // false
isNumber(undefined); // false
isNumber(false); // false
isNumber('   '); // false

4.5 (4 Votes)
0
4.5
6
Shellenge 105 points

                                    var myString     =  &quot;abc123&quot;;
var otherString  =  &quot;123&quot;;
/* isInterger() checks if an value repersents an int  */

Number.isInteger(myString);    //returns false
Number.isInteger(otherString); //returns true

4.5 (6 Votes)
0
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