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This commit is contained in:
Ilya Kantor 2019-09-06 20:13:06 +03:00
parent 7384c9aef2
commit cdc480a577
1 changed files with 4 additions and 4 deletions
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1-js/05-data-types/05-array-methods/article.md
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@ -658,7 +658,7 @@ The value of `thisArg` parameter becomes `this` for `func`.
For instance, here we use an object method as a filter and `thisArg` helps with that: For instance, here we use an object method as a filter and `thisArg` helps with that:
```js run ```js run
let user = { let john = {
age: 18, age: 18,
younger(otherUser) { younger(otherUser) {
return otherUser.age < this.age; return otherUser.age < this.age;
@ -672,14 +672,14 @@ let users = [
]; ];
*!* *!*
// find all users younger than user // find all users younger than john
let youngerUsers = users.filter(user.younger, user); let youngerUsers = users.filter(john.younger, john);
*/!* */!*
alert(youngerUsers.length); // 2 alert(youngerUsers.length); // 2
``` ```
In the call above, we use `user.younger` as a filter and also provide `user` as the context for it. If we didn't provide the context, `users.filter(user.younger)` would call `user.younger` as a standalone function, with `this=undefined`. That would mean an instant error. In the call above, we use `john.younger` as a filter and also provide `john` as the context for it. If we didn't provide the context, `users.filter(john.younger)` would call `john.younger` as a standalone function, with `this=undefined`. That would mean an instant error.
## Summary ## Summary