Скачать или смотреть Write Reusable JavaScript with Functions

What are JavaScript functions? A JavaScript function is a block of code designed to perform a particular task. A JavaScript function is executed when "something" invokes it (calls it).

What is a reusable function in JavaScript? A function is a group of reusable code which can be called anywhere in your program. This eliminates the need of writing the same code again and again. It helps programmers in writing modular code.

How to write reusable function in JavaScript? In JavaScript, we can divide up our code into reusable parts called functions . You can call or invoke this function by using its name followed by parentheses, like this: functionName(); Each time the function is called it will print out the message Hello World on the dev console.

How do you call a function in JavaScript? In JavaScript, we can divide up our code into reusable parts called functions . You can call or invoke this function by using its name followed by parentheses, like this: functionName(); Each time the function is called it will print out the message Hello World on the dev console.

What is JavaScript console log? console.log() The console.log() method outputs a message to the web console. The message may be a single string (with optional substitution values), or it may be any one or more JavaScript objects.