Mar 4, 2023 · Mar 4, 2023 · Mar 4, 2023 · Mar 5, 2023 · Mar 5, 2023
diff --git a/1-js/02-first-steps/15-function-basics/article.md b/1-js/02-first-steps/15-function-basics/article.md

 For example, we need to show a nice-looking message when a visitor logs in, logs out and maybe somewhere else.

 Functions are the main "building blocks" of the program. They allow the code to be called many times withoutrepetition.
 Functions are the main "building blocks" of the program. They allow the code to be called many times withoutrewriting it.

 We've already seen examples of built-in functions, like `alert(message)`, `prompt(message, default)` and `confirm(question)`. But we can create functions of our own as well.


 That's not an error. Such a call would output `"*Ann*: undefined"`. As the value for `text` isn't passed, it becomes `undefined`.

 We can specify the so-called "default" (to use if omitted) value for a parameter in the function declaration, using `=`:
 We can specify the so-called "default"value(to use if omitted) for a parameter in the function declaration, using `=`:

 ```js run
 function showMessage(from, *!*text = "no text given"*/!*) {
 checkPermission(..) // checks a permission, returns true/false
 ```

 With prefixes in place, a glance at a function name gives an understanding what kind of work it does and what kind of value it returns.
 With prefixes in place, a glance at a function name gives an understandingofwhat kind of work it does and what kind of value it returns.

 ```smart header="One function -- one action"
 A function should do exactly what is suggested by its name, no more.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -4,7 +4,7 @@ Quite often we need to perform a similar action in many places of the script.

		For example, we need to show a nice-looking message when a visitor logs in, logs out and maybe somewhere else.

		Functions are the main "building blocks" of the program. They allow the code to be called many times withoutrepetition.
		Functions are the main "building blocks" of the program. They allow the code to be called many times withoutrewriting it.

		We've already seen examples of built-in functions, like `alert(message)`, `prompt(message, default)` and `confirm(question)`. But we can create functions of our own as well.

Expand DownExpand Up		@@ -196,7 +196,7 @@ showMessage("Ann");

		That's not an error. Such a call would output `"Ann: undefined"`. As the value for `text` isn't passed, it becomes `undefined`.

		We can specify the so-called "default" (to use if omitted) value for a parameter in the function declaration, using `=`:
		We can specify the so-called "default"value(to use if omitted) for a parameter in the function declaration, using `=`:

		```js run
		function showMessage(from, !text = "no text given"/!) {
Expand DownExpand Up		@@ -441,7 +441,7 @@ createForm(..) // creates a form (and usually returns it)
		checkPermission(..) // checks a permission, returns true/false
		```

		With prefixes in place, a glance at a function name gives an understanding what kind of work it does and what kind of value it returns.
		With prefixes in place, a glance at a function name gives an understandingofwhat kind of work it does and what kind of value it returns.

		```smart header="One function -- one action"
		A function should do exactly what is suggested by its name, no more.
Expand Down