Code Snippet: Loop the input prompt until a number is entered and convert to an integer

robust integer digit prompt.jsx

(function () {
    // Loop the input prompt until a number is entered
    var origInput;
    while (isNaN(origInput = prompt("Enter a whole number:", "3")));
    // Test if cancel returns null, then terminate the script
    if (origInput === null) {
        alert('Script cancelled!');
        return
    }
    // Test if an empty string is returned, then terminate the script 
    if (origInput === "") {
        alert('A value was not entered, script cancelled!');
        return
    }
    // Convert decimal input to integer
    var inputToInteger = parseInt(origInput);
    
    // Now do something with the final prompt input...
    alert(inputToInteger);
})();