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javascriptnull
Aintripin
Aintripin

Reputation: 53

JavaScript won't check for null condition

So, I'm writing a code in JS that asks the user for their name and prints the greeting in the console. If a user clicks 'cancel' that is the value stored in the variable 'name' is null, the code should return "You didn't give a name". Instead, it prints "Hello, null" which is weird.

var name = prompt("what's your name?");

function hello(name) {
  if ((name == null) || (name == "")) {
    console.log('you didn\'t give me a name')
  } else {
    console.log(`Hello, ${name}!`);
  }
}

hello(name);

expected: "you didn't give a name"

result : "Hello, null"

Upvotes: 1

Views: 133

Answers (2)

Thang Le
Thang Le

Reputation: 21

var name = null;

function hello(name){
    if ((name == 'null') ||( name == "")){
        console.log('you didn\'t give me a name')
    }
    else {
        console.log(`Hello, ${name}!`);
    }  
}

hello(name);

Upvotes: 2

Rahil Ahmad
Rahil Ahmad

Reputation: 3316

name is a string here, whose value is "null" and not null, If you fix the check to name == "null", you should get your desired result

Upvotes: 1

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