how to check if string is a number code example

Example 1: javascript check if a value is an int

// The Number.isInteger() checks to see if the passed value is an integer
// Returns true or false

Number.isInteger(2); //True
Number.isInteger(90); //True
Number.isInteger("37"); //False
Number.isInteger(false); //false

Example 2: java check if string is number

try {
    int n = Integer.parseInt(str);
} catch (NumberFormatException e) {
    // str is not a number
}

Example 3: check if the given string is a number

//Add this to your code and call
static private boolean isMyNumber(String s){
        try{
            Integer.parseInt(s);
            return true;
        }catch (Exception e){
            return false;
        }
    }

Example 4: how to check a number in string

To find whether a given string contains a number,
convert it to a character array and find whether 
each character in the array is a digit using the isDigit() 
method of the Character class

Example 5: check if string can be a number and then make a number

if(Number(myNumber) != NaN){
	myNumber = Number(myNumber);
}