docs: rewrite some examples with var using let and const

Refs #19240
eslint · mdjermanovic · Feb 4, 2025 · Feb 4, 2025 · Feb 4, 2025 · 4dae463ab11b0dfc9f88963824b126a12d3b6508
commit 4dae463ab11b0dfc9f88963824b126a12d3b6508
@@ -7,17 +7,17 @@ rule_type: suggestion
 Because the unary `++` and `--` operators are subject to automatic semicolon insertion, differences in whitespace can change semantics of source code.
 
 ```js
-var i = 10;
-var j = 20;
+let i = 10;
+let j = 20;
 
 i ++
 j
 // i = 11, j = 20
 ```
 
 ```js
-var i = 10;
-var j = 20;
+let i = 10;
+let j = 20;
 
 i
 ++
@@ -36,10 +36,10 @@ Examples of **incorrect** code for this rule:
 ```js
 /*eslint no-plusplus: "error"*/
 
-var foo = 0;
+let foo = 0;
 foo++;
 
-var bar = 42;
+let bar = 42;
 bar--;
 
 for (i = 0; i < l; i++) {
@@ -56,10 +56,10 @@ Examples of **correct** code for this rule:
 ```js
 /*eslint no-plusplus: "error"*/
 
-var foo = 0;
+let foo = 0;
 foo += 1;
 
-var bar = 42;
+let bar = 42;
 bar -= 1;
 
 for (i = 0; i < l; i += 1) {

@@ -19,9 +19,9 @@ Examples of **incorrect** code for this rule:
 ```js
 /*eslint no-proto: "error"*/
 
-var a = obj.__proto__;
+const a = obj.__proto__;
 
-var a = obj["__proto__"];
+const a1 = obj["__proto__"];
 
 obj.__proto__ = b;
 
@@ -37,11 +37,11 @@ Examples of **correct** code for this rule:
 ```js
 /*eslint no-proto: "error"*/
 
-var a = Object.getPrototypeOf(obj);
+const a = Object.getPrototypeOf(obj);
 
 Object.setPrototypeOf(obj, b);
 
-var c = { __proto__: a };
+const c = { __proto__: a };
 ```
 
 :::

@@ -13,13 +13,13 @@ related_rules:
 Regular expressions can be very complex and difficult to understand, which is why it's important to keep them as simple as possible in order to avoid mistakes. One of the more error-prone things you can do with a regular expression is to use more than one space, such as:
 
 ```js
-var re = /foo   bar/;
+const re = /foo   bar/;
 ```
 
 In this regular expression, it's very hard to tell how many spaces are intended to be matched. It's better to use only one space and then specify how many spaces are expected, such as:
 
 ```js
-var re = /foo {3}bar/;
+const re = /foo {3}bar/;
 ```
 
 Now it is very clear that three spaces are expected to be matched.
@@ -35,8 +35,8 @@ Examples of **incorrect** code for this rule:
 ```js
 /*eslint no-regex-spaces: "error"*/
 
-var re = /foo   bar/;
-var re = new RegExp("foo   bar");
+const re = /foo   bar/;
+const re1 = new RegExp("foo   bar");
 ```
 
 :::
@@ -48,8 +48,8 @@ Examples of **correct** code for this rule:
 ```js
 /*eslint no-regex-spaces: "error"*/
 
-var re = /foo {3}bar/;
-var re = new RegExp("foo {3}bar");
+const re = /foo {3}bar/;
+const re1 = new RegExp("foo {3}bar");
 ```
 
 :::

@@ -87,7 +87,7 @@ import event from "event-module";
 /*global event*/
 /*eslint no-restricted-globals: ["error", "event"]*/
 
-var event = 1;
+const event = 1;
 ```
 
 :::

@@ -80,8 +80,8 @@ Examples of **incorrect** code for this rule  with sample `"fs", "cluster", "lod
 ```js
 /*eslint no-restricted-modules: ["error", "fs", "cluster"]*/
 
-var fs = require('fs');
-var cluster = require('cluster');
+const fs = require('fs');
+const cluster = require('cluster');
 ```
 
 :::
@@ -91,7 +91,7 @@ var cluster = require('cluster');
 ```js
 /*eslint no-restricted-modules: ["error", {"paths": ["cluster"] }]*/
 
-var cluster = require('cluster');
+const cluster = require('cluster');
 ```
 
 :::
@@ -101,7 +101,7 @@ var cluster = require('cluster');
 ```js
 /*eslint no-restricted-modules: ["error", { "patterns": ["lodash/*"] }]*/
 
-var pick = require('lodash/pick');
+const pick = require('lodash/pick');
 ```
 
 :::
@@ -113,7 +113,7 @@ Examples of **correct** code for this rule with sample `"fs", "cluster", "lodash
 ```js
 /*eslint no-restricted-modules: ["error", "fs", "cluster"]*/
 
-var crypto = require('crypto');
+const crypto = require('crypto');
 ```
 
 :::
@@ -126,8 +126,8 @@ var crypto = require('crypto');
     "patterns": ["lodash/*", "!lodash/pick"]
 }]*/
 
-var crypto = require('crypto');
-var pick = require('lodash/pick');
+const crypto = require('crypto');
+const pick = require('lodash/pick');
 ```
 
 :::
@@ -71,7 +71,7 @@ with (me) {
     dontMess();
 }
 
-var doSomething = function () {};
+const doSomething = function () {};
 
 foo in bar;
 ```