diff --git a/docs/src/rules/no-eval.md b/docs/src/rules/no-eval.md
index 15c59ecc98b5..1695ef955a28 100644
--- a/docs/src/rules/no-eval.md
+++ b/docs/src/rules/no-eval.md
@@ -12,7 +12,7 @@ further_reading:
JavaScript's `eval()` function is potentially dangerous and is often misused. Using `eval()` on untrusted code can open a program up to several different injection attacks. The use of `eval()` in most contexts can be substituted for a better, alternative approach to a problem.
```js
-var obj = { x: "foo" },
+const obj = { x: "foo" },
key = "x",
value = eval("obj." + key);
```
@@ -28,17 +28,17 @@ Examples of **incorrect** code for this rule:
```js
/*eslint no-eval: "error"*/
-var obj = { x: "foo" },
+const obj = { x: "foo" },
key = "x",
value = eval("obj." + key);
-(0, eval)("var a = 0");
+(0, eval)("const a = 0");
-var foo = eval;
-foo("var a = 0");
+const foo = eval;
+foo("const a = 0");
// This `this` is the global object.
-this.eval("var a = 0");
+this.eval("const a = 0");
```
:::
@@ -51,7 +51,7 @@ Example of additional **incorrect** code for this rule with `window` global vari
/*eslint no-eval: "error"*/
/*global window*/
-window.eval("var a = 0");
+window.eval("const a = 0");
```
:::
@@ -64,7 +64,7 @@ Example of additional **incorrect** code for this rule with `global` global vari
/*eslint no-eval: "error"*/
/*global global*/
-global.eval("var a = 0");
+global.eval("const a = 0");
```
:::
@@ -76,14 +76,14 @@ Examples of **correct** code for this rule:
```js
/*eslint no-eval: "error"*/
-var obj = { x: "foo" },
+const obj = { x: "foo" },
key = "x",
value = obj[key];
class A {
foo() {
// This is a user-defined method.
- this.eval("var a = 0");
+ this.eval("const a = 0");
}
eval() {
@@ -91,7 +91,7 @@ class A {
static {
// This is a user-defined static method.
- this.eval("var a = 0");
+ this.eval("const a = 0");
}
static eval() {
@@ -121,7 +121,7 @@ Example of **incorrect** code for this rule with the `{"allowIndirect": true}` o
```js
/*eslint no-eval: ["error", {"allowIndirect": true} ]*/
-var obj = { x: "foo" },
+const obj = { x: "foo" },
key = "x",
value = eval("obj." + key);
```
@@ -135,12 +135,12 @@ Examples of **correct** code for this rule with the `{"allowIndirect": true}` op
```js
/*eslint no-eval: ["error", {"allowIndirect": true} ]*/
-(0, eval)("var a = 0");
+(0, eval)("const a = 0");
-var foo = eval;
-foo("var a = 0");
+const foo = eval;
+foo("const a = 0");
-this.eval("var a = 0");
+this.eval("const a = 0");
```
:::
@@ -151,7 +151,7 @@ this.eval("var a = 0");
/*eslint no-eval: ["error", {"allowIndirect": true} ]*/
/*global window*/
-window.eval("var a = 0");
+window.eval("const a = 0");
```
:::
@@ -162,7 +162,7 @@ window.eval("var a = 0");
/*eslint no-eval: ["error", {"allowIndirect": true} ]*/
/*global global*/
-global.eval("var a = 0");
+global.eval("const a = 0");
```
:::
@@ -176,13 +176,13 @@ global.eval("var a = 0");
module.exports = function(eval) {
// If the value of this `eval` is built-in `eval` function, this is a
// call of direct `eval`.
- eval("var a = 0");
+ eval("const a = 0");
};
```
* This rule cannot catch renaming the global object. Such as:
```js
- var foo = window;
- foo.eval("var a = 0");
+ const foo = window;
+ foo.eval("const a = 0");
```
diff --git a/docs/src/rules/no-nested-ternary.md b/docs/src/rules/no-nested-ternary.md
index 58bcad30808d..3b3bae87cb67 100644
--- a/docs/src/rules/no-nested-ternary.md
+++ b/docs/src/rules/no-nested-ternary.md
@@ -10,7 +10,7 @@ related_rules:
Nesting ternary expressions can make code more difficult to understand.
```js
-var foo = bar ? baz : qux === quxx ? bing : bam;
+const foo = bar ? baz : qux === quxx ? bing : bam;
```
## Rule Details
@@ -24,7 +24,7 @@ Examples of **incorrect** code for this rule:
```js
/*eslint no-nested-ternary: "error"*/
-var thing = foo ? bar : baz === qux ? quxx : foobar;
+const thing = foo ? bar : baz === qux ? quxx : foobar;
foo ? baz === qux ? quxx() : foobar() : bar();
```
@@ -38,16 +38,16 @@ Examples of **correct** code for this rule:
```js
/*eslint no-nested-ternary: "error"*/
-var thing = foo ? bar : foobar;
+const thing = foo ? bar : foobar;
-var thing;
+let otherThing;
if (foo) {
- thing = bar;
+ otherThing = bar;
} else if (baz === qux) {
- thing = quxx;
+ otherThing = quxx;
} else {
- thing = foobar;
+ otherThing = foobar;
}
```
diff --git a/docs/src/rules/no-ternary.md b/docs/src/rules/no-ternary.md
index b4ff25846340..d5c6558b5e90 100644
--- a/docs/src/rules/no-ternary.md
+++ b/docs/src/rules/no-ternary.md
@@ -10,7 +10,7 @@ related_rules:
The ternary operator is used to conditionally assign a value to a variable. Some believe that the use of ternary operators leads to unclear code.
```js
-var foo = isBar ? baz : qux;
+const foo = isBar ? baz : qux;
```
## Rule Details
@@ -24,7 +24,7 @@ Examples of **incorrect** code for this rule:
```js
/*eslint no-ternary: "error"*/
-var foo = isBar ? baz : qux;
+const foo = isBar ? baz : qux;
function quux() {
return foo ? bar() : baz();
@@ -40,7 +40,7 @@ Examples of **correct** code for this rule:
```js
/*eslint no-ternary: "error"*/
-var foo;
+let foo;
if (isBar) {
foo = baz;
diff --git a/docs/src/rules/no-undefined.md b/docs/src/rules/no-undefined.md
index 10096533a646..5fb7533e60e5 100644
--- a/docs/src/rules/no-undefined.md
+++ b/docs/src/rules/no-undefined.md
@@ -17,7 +17,7 @@ The `undefined` variable in JavaScript is actually a property of the global obje
```js
function doSomething(data) {
- var undefined = "hi";
+ const undefined = "hi";
// doesn't do what you think it does
if (data === undefined) {
@@ -46,9 +46,9 @@ Examples of **incorrect** code for this rule:
```js
/*eslint no-undefined: "error"*/
-var foo = undefined;
+const foo = undefined;
-var undefined = "foo";
+const undefined = "foo";
if (foo === undefined) {
// ...
@@ -70,9 +70,9 @@ Examples of **correct** code for this rule:
```js
/*eslint no-undefined: "error"*/
-var foo = void 0;
+const foo = void 0;
-var Undefined = "foo";
+const Undefined = "foo";
if (typeof foo === "undefined") {
// ...
diff --git a/docs/src/rules/no-unneeded-ternary.md b/docs/src/rules/no-unneeded-ternary.md
index b90b93bfd56f..22f42026ce11 100644
--- a/docs/src/rules/no-unneeded-ternary.md
+++ b/docs/src/rules/no-unneeded-ternary.md
@@ -13,16 +13,16 @@ Here are some examples:
```js
// Bad
-var isYes = answer === 1 ? true : false;
+const isYes = answer === 1 ? true : false;
// Good
-var isYes = answer === 1;
+const isYes = answer === 1;
// Bad
-var isNo = answer === 1 ? false : true;
+const isNo = answer === 1 ? false : true;
// Good
-var isNo = answer !== 1;
+const isNo = answer !== 1;
```
Another common mistake is using a single variable as both the conditional test and the consequent. In such cases, the logical `OR` can be used to provide the same functionality.
@@ -47,9 +47,9 @@ Examples of **incorrect** code for this rule:
```js
/*eslint no-unneeded-ternary: "error"*/
-var a = x === 2 ? true : false;
+const a = x === 2 ? true : false;
-var a = x ? true : false;
+const b = x ? true : false;
```
:::
@@ -61,13 +61,13 @@ Examples of **correct** code for this rule:
```js
/*eslint no-unneeded-ternary: "error"*/
-var a = x === 2 ? "Yes" : "No";
+const a = x === 2 ? "Yes" : "No";
-var a = x !== false;
+const b = x !== false;
-var a = x ? "Yes" : "No";
+const c = x ? "Yes" : "No";
-var a = x ? y : x;
+const d = x ? y : x;
f(x ? x : 1); // default assignment - would be disallowed if defaultAssignment option set to false. See option details below.
```
@@ -92,7 +92,7 @@ Examples of additional **incorrect** code for this rule with the `{ "defaultAssi
```js
/*eslint no-unneeded-ternary: ["error", { "defaultAssignment": false }]*/
-var a = x ? x : 1;
+const a = x ? x : 1;
f(x ? x : 1);
```
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