Why does node say undefined?
node also prints undefined because IN GENERAL it shows the return value of each command and console. this is happening because console. log has a return type (null/undefined) to solve this problem… have a function that returns a string… then log the value returned by the function… that will solve the undefined problem…
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Why does the console print undefined?
It has the side effect of printing to the console. You can observe the same behavior with many expressions: > var x = 1; undefined; A variable declaration does not produce a value, so undefined is again printed to the console.
Why does the Javascript console say undefined?
A variable that has not been assigned a value is of undefined type. A method or declaration also returns undefined if the variable being evaluated does not have a value assigned to it. A function returns undefined if no value was returned.
Why does node print undefined to the console?
node also prints undefined because IN GENERAL it shows the return value of each command and console.log returns nothing. this happens because console.log has a return type (null/undefined) to solve this problem… have a function that returns a string… then log the value returned by the function… that will solve the undefined problem…
How to avoid undefined output from Node.js?
So node used to print an undefined return type for the called function. Check undefined here, https://nodejs.org/api/util.html. To avoid seeing undefined results from commands when using Node’s repl module, set ignoreUndefined to true in repl.start. Thanks for contributing an answer to Stack Overflow! Please make sure you answer the question.
What are the causes of undefined existence in JavaScript?
undefined existence is a consequence of the permissive nature of JavaScript which allows the use of: 1 uninitialized variables 2 non-existent object properties or methods 3 out-of-bounds indices for accessing array elements 4 the result of invoking a function that returns nothing
Why is there only one instance of printnode?
Only one instance of the PrintNode client is running, regardless of how many active user sessions there are on a given machine (this helps prevent certain issues, such as duplicate printing). The end user doesn’t have access to the desktop app interface, which makes it less likely to break something.
What does undefined mean in node?
undefined , in this context, means that the statement has nothing to return.
What does undefined mean in the console?
The undefined is the return value from the console. Log in(…) . You can see this by defining two functions in the console, one that returns something and the other that returns nothing, for example, like this: function f1() { return 1; } function f2() { return; }
Why does the console show undefined?
How to go undefined in Node.js console?
Just type “hello world”; and press enter… it will return “hello world” instead of undefined, so it doesn’t show undefined. console.log returns undefined and also logs arguments to the console so you get various messages. JavaScript functions always return something.
How to activate ignoreundefined in Node.js?
If you need to trigger ignoreUndefined from within a module, you can use the following line to simulate AvinashB’s response without writing to the console yourself: node also prints undefined because IN GENERAL it shows the return value of each command and console .log it returns nothing.
Why does console.log say undefined then correct?
If a browser doesn’t display the undefined, it means that it has noticed that its console input only prints to the console, so it skips displaying the output. Returns the value of console.log(…). Define two functions like this and you’ll see why. The functionB() returns undefined.
When to use undefined vs undefined in JS?
A variable declaration does not produce a value, so undefined is again printed to the console. As a counterexample, expressions containing mathematical operators produce a value that is printed to the console instead of undefined: undefined is the return value of console.log(). This is the standard behavior of the Chrome JS Console