Javascript writing if statements to prompt user for input

Question

var noun;
var verb;
var adverb;
var adjective;
var pronoun;
var questions = 5; //this number can adjust
var paragraph;

var noun = prompt("Type Noun");
if (isNaN(noun) == "True"){
 questions -= 1;
 verb = prompt("Type Verb");
}else{
   alert("You entered a number, please enter a Noun.");
}
if (isNaN(verb) == "True"){
 questions -= 1;
 adverb = prompt("Type Adverb");
}else{
   alert("You entered a number, please enter a Verb.");
}
if (isNaN(adverb) == "True"){
 questions -= 1;
 adjective = prompt("Type Adjective");
}else{
   alert("You entered a number, please enter a Adverb.");
}
if (isNaN(pronoun) == "True"){
 questions -= 1;
}else{
   alert("You entered a number, please enter a Pronoun.");
}

So the main idea is to have the user input a word. For some reason it marks the boolean false and goes directly into the else statement.....

As it iterates through each one, so the initial one was marked false. Then it skips to each else statement, skipping the if statement. — Chris Herzog
– Chris Herzog, Commented Apr 15, 2017 at 3:31

pbarrasso · Accepted Answer · 2017-04-15 03:33:59Z

1

This is because isNaN("some text") returns a boolean true/false -- and true == "True" returns false. Your statements should read:

if (isNaN(noun) === true) {
}
....

answered Apr 15, 2017 at 3:33

pbarrasso

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