Merge branch 'master' of github.com:javascript-tutorial/en.javascript.info into sync-ff152b12

Author: iliakan

1-js/02-first-steps/05-types/article.md

@@ -255,7 +255,7 @@ The last three lines may need additional explanation:
 
 There are 8 basic data types in JavaScript.
 
-- `number` for numbers of any kind: integer or floating-point, integers are limited by ±2<sup>53</sup>.
+- `number` for numbers of any kind: integer or floating-point, integers are limited by <code>±(2<sup>53</sup>-1)</code>.
 - `bigint` is for integer numbers of arbitrary length.
 - `string` for strings. A string may have zero or more characters, there's no separate single-character type.
 - `boolean` for `true`/`false`.

1-js/02-first-steps/06-alert-prompt-confirm/article.md

@@ -31,7 +31,7 @@ It shows a modal window with a text message, an input field for the visitor, and
 : An optional second parameter, the initial value for the input field.
 
 ```smart header="The square brackets in syntax `[...]`"
-The square brackets around `default` in the syntax above denote that the parameter as optional, not required.
+The square brackets around `default` in the syntax above denote that the parameter is optional, not required.
 ```
 
 The visitor can type something in the prompt input field and press OK. Then we get that text in the `result`. Or they can cancel the input by pressing Cancel or hitting the `key:Esc` key, then we get `null` as the `result`.

1-js/02-first-steps/08-operators/4-fix-prompt/solution.md

@@ -9,7 +9,8 @@ let b = "2"; // prompt("Second number?", 2);
 alert(a + b); // 12
 ```
 
-What we should to is to convert strings to numbers before `+`. For example, using `Number()` or prepending them with `+`.
+What we should do is to convert strings to numbers before `+`. For example, using `Number()` or
+prepending them with `+`.
 
 For example, right before `prompt`:
 

1-js/02-first-steps/13-while-for/6-repeat-until-correct/solution.md

@@ -10,6 +10,6 @@ do {
 The loop `do..while` repeats while both checks are truthy:
 
 1. The check for `num <= 100` -- that is, the entered value is still not greater than `100`.
-2. The check `&& num` is false when `num` is `null` or a empty string. Then the `while` loop stops too.
+2. The check `&& num` is false when `num` is `null` or an empty string. Then the `while` loop stops too.
 
 P.S. If `num` is `null` then `num <= 100` is `true`, so without the 2nd check the loop wouldn't stop if the user clicks CANCEL. Both checks are required.

1-js/04-object-basics/02-object-copy/article.md

@@ -215,8 +215,6 @@ alert(clone.sizes.width); // 51, see the result from the other one
 
 To fix that, we should use the cloning loop that examines each value of `user[key]` and, if it's an object, then replicate its structure as well. That is called a "deep cloning".
 
-There's a standard algorithm for deep cloning that handles the case above and more complex cases, called the [Structured cloning algorithm](https://html.spec.whatwg.org/multipage/structured-data.html#safe-passing-of-structured-data).
-
 We can use recursion to implement it. Or, not to reinvent the wheel, take an existing implementation, for instance [_.cloneDeep(obj)](https://lodash.com/docs#cloneDeep) from the JavaScript library [lodash](https://lodash.com).
 
 ## Summary

1-js/04-object-basics/04-object-methods/4-object-property-this/solution.md

@@ -7,7 +7,7 @@ function makeUser() {
     name: "John",
     ref: this
   };
-};
+}
 
 let user = makeUser();
 
@@ -45,7 +45,7 @@ function makeUser() {
     }
 */!*
   };
-};
+}
 
 let user = makeUser();
 

1-js/04-object-basics/04-object-methods/4-object-property-this/task.md

@@ -14,7 +14,7 @@ function makeUser() {
     name: "John",
     ref: this
   };
-};
+}
 
 let user = makeUser();