How do you call a function named 'myfunction' in JavaScript?

• Key Takeaways
• How to Call a Function in JavaScript
• When to Call a Function
• Conclusion
• Sources

#Key Takeaways

• JavaScript functions can be called in several ways: using the function name followed by parentheses, using a variable name that references the function, or using the apply() and call() methods.
• The most common way to call a function is to use the function name followed by parentheses containing any arguments that need to be passed in.
• The call() and apply() methods allow you to set the value of this inside the function when calling it.
• Functions should be called when you need to execute a block of code multiple times or abstract some logic away into a reusable unit.

#How to Call a Function in JavaScript

There are a few different ways to call a function in JavaScript:

• Using the function name: Simply use the name of the function followed by parentheses. Any arguments go inside the parentheses.

  function myFunction(name) {
    console.log('Hello ' + name);
  }
  
  myFunction('John'); // Prints "Hello John"
  

• Using a variable: If the function is assigned to a variable, you can call it using the variable name.

  const myFunction = function(name) {
    console.log('Hello ' + name);
  }
  
  myFunction('Sarah'); // Prints "Hello Sarah"
  

• Using apply() and call(): These methods allow you to set the value of this in the function when calling it.

  const myObject = {
    name: 'Mary',
    greet: function() {
      console.log('Hello ' + this.name);
    }
  }
  
  myObject.greet(); // Prints "Hello Mary"
  
  const myOtherObject = {
    name: 'John' 
  };
  
  myObject.greet.call(myOtherObject); // Prints "Hello John"
  

So in summary, the most common way to call a function is using its name followed by parentheses containing arguments. The apply() and call() methods provide more control over this when calling the function.

#When to Call a Function

Some good cases for calling a function include:

• When you need to execute the same logic multiple times
• When you want to abstract some complex code into a reusable block
• When you need to perform a common task like updating the DOM

For example, you may want to call a function to update the page title every time the user navigates to a new page. Or call a function to fetch data from an API endpoint.

Generally functions should be called whenever you need to perform a task that can be self-contained in a function. This makes code more organized and maintainable.

#Conclusion

Calling functions is a fundamental concept in JavaScript. The main ways to call a function are using its name, a variable that references it, or apply()/call(). Functions should be called when you need to reuse some logic or abstract a complex task. Using functions makes code more readable and maintainable.

#Sources

Function.prototype.call() - JavaScript | MDN
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/call

How to Call a Function in JavaScript
https://blog.hubspot.com/website/call-function-javascript

Method Reuse
https://w3schools.com/js/js_function_call.asp