Sep 23, 2020 · Sep 20, 2020
diff --git a/1-js/02-first-steps/11-logical-operators/6-check-if-in-range/task.md b/1-js/02-first-steps/11-logical-operators/6-check-if-in-range/task.md

 # Check the range between

 Write an"if" condition to check that `age` is between `14` and `90` inclusively.
 Write an`if` condition to check that `age` is between `14` and `90` inclusively.

 "Inclusively" means that `age` can reach the edges `14` or `90`.
diff --git a/1-js/02-first-steps/11-logical-operators/7-check-if-out-range/task.md b/1-js/02-first-steps/11-logical-operators/7-check-if-out-range/task.md

 # Check the range outside

 Write an `if` condition to check that `age` is NOT between14 and90 inclusively.
 Write an `if` condition to check that `age` is NOT between`14` and`90` inclusively.

 Create two variants: the first one using NOT `!`, the second one -- without it.
diff --git a/1-js/02-first-steps/11-logical-operators/9-check-login/solution.md b/1-js/02-first-steps/11-logical-operators/9-check-login/solution.md
 ```js run demo
 let userName = prompt("Who's there?", '');

 if (userName == 'Admin') {
 if (userName === 'Admin') {

  let pass = prompt('Password?', '');

  if (pass == 'TheMaster') {
  if (pass === 'TheMaster') {
    alert( 'Welcome!' );
  } else if (pass == '' || pass == null) {
  } else if (pass === '' || pass=== null) {
    alert( 'Canceled' );
  } else {
    alert( 'Wrong password' );
  }

 } else if (userName == '' || userName == null) {
 } else if (userName === '' || userName=== null) {
  alert( 'Canceled' );
 } else {
  alert( "I don't know you" );
diff --git a/1-js/02-first-steps/11-logical-operators/article.md b/1-js/02-first-steps/11-logical-operators/article.md

 A value is returned in its original form, without the conversion.

 In other words, a chain of OR `"||"` returns the first truthy value or the last one if no truthy value is found.
 In other words, a chain of OR `||` returns the first truthy value or the last one if no truthy value is found.

 For instance:


 1. **Getting the first truthy value from a list of variables or expressions.**

    For instance, we have `firstName`, `lastName` and `nickName` variables, all optional.
    For instance, we have `firstName`, `lastName` and `nickName` variables, all optional (i.e. can be undefined or have falsy values).

    Let's use OR `||` to choose the one that has the data and show it (or `anonymous` if nothing set):
    Let's use OR `||` to choose the one that has the data and show it (or `"Anonymous"` if nothing set):

    ```js run
    let firstName = "";
    */!*
    ```

    If all variables were falsy, `Anonymous` would show up.
    If all variables were falsy, `"Anonymous"` would show up.

 2. **Short-circuit evaluation.**

 So the code `a && b || c && d` is essentially the same as if the `&&` expressions were in parentheses: `(a && b) || (c && d)`.
 ````

 ````warn header="Don't replace `if` with|| or&&"
 ````warn header="Don't replace `if` with`||` or`&&`"
 Sometimes, people use the AND `&&` operator as a "shorter way to write `if`".

 For instance:
 if (x > 0) alert( 'Greater than zero!' );
 ```

 Although, the variant with `&&` appears shorter, `if` is more obvious and tends to be a little bit more readable. So we recommend using every construct for its purpose: use `if` if we wantif and use `&&` if we want AND.
 Although, the variant with `&&` appears shorter, `if` is more obvious and tends to be a little bit more readable. So we recommend using every construct for its purpose: use `if` if we want`if` and use `&&` if we want AND.
 ````
Original file line number	Diff line number	Diff line change
Expand Up		@@ -4,6 +4,6 @@ importance: 3

		# Check the range between

		Write an"if" condition to check that `age` is between `14` and `90` inclusively.
		Write an`if` condition to check that `age` is between `14` and `90` inclusively.

		"Inclusively" means that `age` can reach the edges `14` or `90`.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -4,6 +4,6 @@ importance: 3

		# Check the range outside

		Write an `if` condition to check that `age` is NOT between14 and90 inclusively.
		Write an `if` condition to check that `age` is NOT between`14` and`90` inclusively.

		Create two variants: the first one using NOT `!`, the second one -- without it.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -3,19 +3,19 @@
		```js run demo
		let userName = prompt("Who's there?", '');

		if (userName == 'Admin') {
		if (userName === 'Admin') {

		let pass = prompt('Password?', '');

		if (pass == 'TheMaster') {
		if (pass === 'TheMaster') {
		alert( 'Welcome!' );
		} else if (pass == '' \|\| pass == null) {
		} else if (pass === '' \|\| pass=== null) {
		alert( 'Canceled' );
		} else {
		alert( 'Wrong password' );
		}

		} else if (userName == '' \|\| userName == null) {
		} else if (userName === '' \|\| userName=== null) {
		alert( 'Canceled' );
		} else {
		alert( "I don't know you" );
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -84,7 +84,7 @@ The OR `\|\|` operator does the following:

		A value is returned in its original form, without the conversion.

		In other words, a chain of OR `"\|\|"` returns the first truthy value or the last one if no truthy value is found.
		In other words, a chain of OR `\|\|` returns the first truthy value or the last one if no truthy value is found.

		For instance:

Expand All		@@ -101,9 +101,9 @@ This leads to some interesting usage compared to a "pure, classical, boolean-onl

		1. Getting the first truthy value from a list of variables or expressions.

		For instance, we have `firstName`, `lastName` and `nickName` variables, all optional.
		For instance, we have `firstName`, `lastName` and `nickName` variables, all optional (i.e. can be undefined or have falsy values).

		Let's use OR `\|\|` to choose the one that has the data and show it (or `anonymous` if nothing set):
		Let's use OR `\|\|` to choose the one that has the data and show it (or `"Anonymous"` if nothing set):

		```js run
		let firstName = "";
Expand All		@@ -115,7 +115,7 @@ This leads to some interesting usage compared to a "pure, classical, boolean-onl
		/!
		```

		If all variables were falsy, `Anonymous` would show up.
		If all variables were falsy, `"Anonymous"` would show up.

		2. Short-circuit evaluation.

Expand DownExpand Up		@@ -223,7 +223,7 @@ The precedence of AND `&&` operator is higher than OR `\|\|`.
		So the code `a && b \|\| c && d` is essentially the same as if the `&&` expressions were in parentheses: `(a && b) \|\| (c && d)`.
		````

		````warn header="Don't replace `if` with\|\| or&&"
		````warn header="Don't replace `if` with`\|\|` or`&&`"
		Sometimes, people use the AND `&&` operator as a "shorter way to write `if`".

		For instance:
Expand All		@@ -244,7 +244,7 @@ let x = 1;
		if (x > 0) alert( 'Greater than zero!' );
		```

		Although, the variant with `&&` appears shorter, `if` is more obvious and tends to be a little bit more readable. So we recommend using every construct for its purpose: use `if` if we wantif and use `&&` if we want AND.
		Although, the variant with `&&` appears shorter, `if` is more obvious and tends to be a little bit more readable. So we recommend using every construct for its purpose: use `if` if we want`if` and use `&&` if we want AND.
		````


Expand Down