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This commit is contained in:
Lê Duy Quang
2021-02-25 04:21:57 -05:00
committed by Jean-Philippe Sirois
parent 0862031bf9
commit b854b46050
1 changed files with 35 additions and 35 deletions
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src/content/resources/language/javascript/cannot-read-property.md
+35 -35
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@@ -56,9 +56,9 @@ This applies to nonexistent array indices as well.
```js
> let keyMapping = {
moveUp: "KeyW",
moveDown: "KeyS",
moveLeft: "KeyA",
moveRight: "KeyD"
moveDown: "KeyS",
moveLeft: "KeyA",
moveRight: "KeyD"
};
undefined
> keyMapping.mvoeDown
@@ -84,22 +84,22 @@ read property" error might arise.
```html
<!DOCTYPE html>
<html>
<body>
<p id=paragraph-1>Welcome to <i>The programmer's hangout</i>.</p>
<p id=paragraph-2>
This is the place for programmers of any skill level to, well, hangout
with other fellow programmers. Whether you have just written 5 lines of
code or been a code nerd for 15 years, you are always welcome!
</p>
<script>
let element = document.getElementById("paragraph-3");
// The one writing this might think this will add another paragraph to
// the page, which is not how it works.
// The browser, failing to find any element with ID "paragraph-3" from
// the page, returns null.
element.innerText = "When joining, make sure you read the rules.";
</script>
</body>
<body>
<p id=paragraph-1>Welcome to <i>The programmer's hangout</i>.</p>
<p id=paragraph-2>
This is the place for programmers of any skill level to, well, hangout
with other fellow programmers. Whether you have just written 5 lines of
code or been a code nerd for 15 years, you are always welcome!
</p>
<script>
let element = document.getElementById("paragraph-3");
// The one writing this might think this will add another paragraph to
// the page, which is not how it works.
// The browser, failing to find any element with ID "paragraph-3" from
// the page, returns null.
element.innerText = "When joining, make sure you read the rules.";
</script>
</body>
</html>
```
@@ -143,21 +143,21 @@ one can make sure what is in their hands isn't JavaScript's default
```js
async function onCommand(channel, arguments) {
// Assuming the command is not empty and
// there is always the first argument.
// there is always the first argument.
let commandName = arguments[0];
switch (commandName) {
// ...
case "getUser":
if (arguments.length < 2)
throw "Usage: /getUser <username>";
// It is guaranteed now that "arguments" has at least 2 elements
// and thus there is an index 1.
let username = arguments[1];
let user = await botClient.fetchUser(username);
channel.send(JSON.stringify(user);
break;
// ...
}
switch (commandName) {
// ...
case "getUser":
if (arguments.length < 2)
throw "Usage: /getUser <username>";
// It is guaranteed now that "arguments" has at least 2 elements
// and thus there is an index 1.
let username = arguments[1];
let user = await botClient.fetchUser(username);
channel.send(JSON.stringify(user);
break;
// ...
}
}
```
@@ -170,8 +170,8 @@ sure that situation is handled properly.
async function getUserID(username) {
// Assuming "username" is guaranteed to be a string.
let user = await botClient.fetchUser(username);
if (user == null) throw "There is no user with that name.";
// It is guaranteed now that "user" isn't null.
if (user == null) throw "There is no user with that name.";
// It is guaranteed now that "user" isn't null.
return user.id;
}
```