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minor typos and English improvements

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Omer Baddour 2022-04-20 14:16:17 -04:00 • committed by GitHub
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1-js/02-first-steps/16-function-expressions/article.md
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@ -90,7 +90,7 @@ Everything would work the same.
````smart header="Why is there a semicolon at the end?" ````smart header="Why is there a semicolon at the end?"
You might wonder, why does Function Expression have a semicolon `;` at the end, but Function Declaration does not: You might wonder, why do Function Expressions have a semicolon `;` at the end, but Function Declarations do not:
```js ```js
function sayHi() { function sayHi() {
@ -144,13 +144,13 @@ function showCancel() {
ask("Do you agree?", showOk, showCancel); ask("Do you agree?", showOk, showCancel);
``` ```
In practice, such functions are quite useful. The major difference between a real-life `ask` and the example above is that real-life functions use more complex ways to interact with the user than a simple `confirm`. In the browser, such function usually draws a nice-looking question window. But that's another story. In practice, such functions are quite useful. The major difference between a real-life `ask` and the example above is that real-life functions use more complex ways to interact with the user than a simple `confirm`. In the browser, such functions usually draw a nice-looking question window. But that's another story.
**The arguments `showOk` and `showCancel` of `ask` are called *callback functions* or just *callbacks*.** **The arguments `showOk` and `showCancel` of `ask` are called *callback functions* or just *callbacks*.**
The idea is that we pass a function and expect it to be "called back" later if necessary. In our case, `showOk` becomes the callback for "yes" answer, and `showCancel` for "no" answer. The idea is that we pass a function and expect it to be "called back" later if necessary. In our case, `showOk` becomes the callback for "yes" answer, and `showCancel` for "no" answer.
We can use Function Expressions to write the same function much shorter: We can use Function Expressions to write an equivalent, shorter function:
```js run no-beautify ```js run no-beautify
function ask(question, yes, no) { function ask(question, yes, no) {
@ -186,7 +186,7 @@ Let's formulate the key differences between Function Declarations and Expression
First, the syntax: how to differentiate between them in the code. First, the syntax: how to differentiate between them in the code.
- *Function Declaration:* a function, declared as a separate statement, in the main code flow. - *Function Declaration:* a function, declared as a separate statement, in the main code flow:
```js ```js
// Function Declaration // Function Declaration