js check if string is int

1// native returns true if the variable does NOT contain a valid number
2isNaN(num)
3
4// can be wrapped for making simple and readable
5function isNumeric(num){
6  return !isNaN(num)
7}
8
9isNumeric(123)         // true
10isNumeric('123')       // true
11isNumeric('1e10000')   // true (This translates to Infinity, which is a number)
12isNumeric('foo')       // false
13isNumeric('10px')      // false

1v = 10
2type(v)
3# <type 'int'>

1function isNumeric(num){
2  return !isNaN(num)
3}
4isNumeric("23.33"); //true, checking if string is a number. 

1function isInt(str) {
2  return !isNaN(str) && Number.isInteger(parseFloat(str));
3}

1function isNumeric(str) {
2
3	// Check if input is string
4	if (typeof str != "string")
5    	return false
6
7	// Use type coercion to parse the _entirety_ of the string
8    // (`parseFloat` alone does not do this).
9	// Also ensure that the strings whitespaces fail
10	return !isNaN(str) && 
11		!isNaN(parseFloat(str)) 
12}