Table of Contents
Is console log a variable?
The console. log() is a function in JavaScript which is used to print any kind of variables defined before in it or to just print any message that needs to be displayed to the user.
Why does console return undefined?
undefined is a property of the global object. That is, it is a variable in global scope. A method or statement also returns undefined if the variable that is being evaluated does not have an assigned value. A function returns undefined if a value was not returned .
What is the difference between console log and setProperty?
console. log is for displaying on the app. setProperty affects the app display and console.
Is console log synchronous or asynchronous?
console. log() is put in the event queue until all code is executed, then it is ran and it would have the bar property. It appears though it is running synchronously.
Is console log bad for production?
Generally yes, its not a great idea to expose log messages in your production code.
What does undefined in console mean?
Undefined means a variable has been declared, but the value of that variable has not yet been defined. For example: var test2;console.log(test2); // undefined. Unlike null , undefined is of the type undefined : console.log(typeof test2);
What is the need to have console log even when there is document write?
log() is used to for debugging purpose. While document. write() is used when you want some thing to be written on DOM of browser.
How do I log multiple variables in console log?
The most common way to log something to console is to simply call console.log () with one argument: console.log(‘My message’); Sometimes you might want a message containing multiple variables. Fortunately, console.log () can format the string in a sprintf () way using specifiers like \%s, \%i, etc.
How to use console log (message) usage?
console.log (message) usage is simple: the argument message is logged to console. This post presents 5 useful tips to help you become more productive when using console.log (). 1. Naming logged variables 2. Advanced formatting 3. Log with style 4. Interactive logs 5. Logging big objects in Node console 1. Naming logged variables
How do I log a story in console log?
console.log takes multiple arguments, so just use: console.log (“story”, name, “story”); If name is an object or an array then using multiple arguments is better than concatenation. If you concatenate an object or array into a string you simply log the type rather than the content of the variable.
How do you format a console log in Python?
Advanced formatting The most common way to log something to console is to simply call console.log () with one argument: Sometimes you might want a message containing multiple variables. Fortunately, console.log () can format the string in a sprintf () way using specifiers like \%s, \%i, etc.