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I'm trying to learn Node and have the function:
this.logMeIn = function(username,stream) {
if (username === null || username.length() < 1) {
stream.write("Invalid username, please try again:\n\r");
return false;
} else {
....etc
and I'm passing it
if (!client.loggedIn) {
if (client.logMeIn(String(data.match(/\S+/)),stream)) {
I've tried both == and ===, but I'm still getting errors as the username is not detecting that it is null, and username.length() fails on:
if (username === null || username.length() < 1) {
^
TypeError: Property 'length' of object null is not a function
I'm sure that Node won't evaluate the second part of the || in the if statement when the first part is true - but I fail to understand why the first part of the if statement is evaluating to false when username is a null object. Can someone help me understand what I've done wrong?
829
For an empty string, length is 0.
Empty string, undefined, null, ... To check for a truthy value: if (strValue) { // strValue was non-empty string, true, 42, Infinity, [], ... } To check for a falsy value: if (!strValue) { // strValue was empty string, false, 0, null, undefined, ... }
The isEmpty() method checks whether a string is empty or not. This method returns true if the string is empty (length() is 0), and false if not.
length is an attribute, not a function. Try username.length
70
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