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This commit is contained in:
Jean-Philippe Sirois
2021-02-25 04:24:10 -05:00
parent f782589856
commit 46e8651b31
1 changed files with 32 additions and 34 deletions
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src/content/resources/language/javascript/cannot-read-property.md
+32 -34
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@@ -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>
```
@@ -184,11 +184,11 @@ sure that situation is handled properly.
```js
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.
return user.id;
// 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.
return user.id;
}
```
@@ -200,10 +200,8 @@ ultimately receive a value, the error won't be able to occur.
```js
let payload;
let rolledValue = Math.random();
if (rolledValue > 0.5)
payload = { id: 169323, message: "Welcome to TPH." };
else
payload = { id: 173205, message: "TPH has been waiting for you." };
if (rolledValue > 0.5) payload = { id: 169323, message: "Welcome to TPH." };
else payload = { id: 173205, message: "TPH has been waiting for you." };
// In either case, "payload" is guaranteed to be assigned an actual value.
botClient.sendMessage(serverJoiner, payload.message);
```
@@ -215,17 +213,17 @@ provide default values for function arguments, if applicable.
```js
function sendEmbed(content, options = { color: "#888", dismissable: false }) {
let embed = botClient.createEmbed();
embed.setContent(content);
embed.setColor(options.color);
embed.setDismissable(options.dismissable);
botClient.sendEmbed(embed);
let embed = botClient.createEmbed();
embed.setContent(content);
embed.setColor(options.color);
embed.setDismissable(options.dismissable);
botClient.sendEmbed(embed);
}
sendEmbed(
"The programmer's hangout: https://theprogrammershangout.com",
{ color: "#763989", dismissable: true }
);
sendEmbed("The programmer's hangout: https://theprogrammershangout.com", {
color: "#763989",
dismissable: true,
});
sendEmbed("Example site: https://example.com");
// No value is passed to "options" by the caller,