2019-12-08 00:11:14 +00:00
---
2019-12-08 00:11:14 +00:00
id: 5ddb965c65d27e1512d44db0
2019-12-08 00:11:14 +00:00
title: Part 25
challengeType: 0
2021-01-13 02:31:00 +00:00
dashedName: part-25
2019-12-08 00:11:14 +00:00
---
2020-11-27 18:02:05 +00:00
# --description--
2019-12-08 00:11:14 +00:00
2019-12-08 00:11:14 +00:00
Use a ternary operator to assign the value of `maxCalories` . A ternary operator has the following syntax: `condition ? expressionTrue : expressionFalse` .
2019-12-08 00:11:14 +00:00
2019-12-08 00:11:14 +00:00
For example, `(5 - 3 === 4) ? "Yes" : "No"` does the same thing as the following if else statement:
2019-12-08 00:11:14 +00:00
2019-12-08 00:11:14 +00:00
```js
if (5 - 3 === 4) {
return 'Yes';
} else {
return 'No';
}
```
2019-12-08 00:11:14 +00:00
2019-12-08 00:11:14 +00:00
`document.getElementById('female').checked` will return either `true` if it is checked or `false` if it isn't. Use a ternary operator to return 2000 if it is is checked and 2500 if it is not.
2019-12-08 00:11:14 +00:00
2020-11-27 18:02:05 +00:00
# --hints--
2019-12-08 00:11:14 +00:00
2020-11-27 18:02:05 +00:00
See description above for instructions.
2019-12-08 00:11:14 +00:00
2020-11-27 18:02:05 +00:00
```js
assert(
/const\s*maxCalories\s*=\s*document\.getElementById\([\'\"\`]female[\'\"\`]\)\.checked\s*\?\s*2000\s*\:\s*2500/.test(
code
)
);
2019-12-08 00:11:14 +00:00
```
2020-11-27 18:02:05 +00:00
# --seed--
2019-12-08 00:11:14 +00:00
2020-11-27 18:02:05 +00:00
## --before-user-code--
2019-12-08 00:11:14 +00:00
```html
<!DOCTYPE html>
< html >
< head >
< meta charset = "utf-8" / >
< title > < / title >
< meta name = "description" content = "" / >
< meta name = "viewport" content = "width=device-width, initial-scale=1" / >
< link rel = "stylesheet" href = "styles.css" / >
< / head >
< body >
< div class = "container" >
< form id = "calorie-form" >
< h2 class = "center" > Calorie Counter< / h2 >
< div class = "grid" >
< legend > Sex< / legend >
< div >
< input type = "radio" name = "sex" id = "female" value = "F" checked / >
< label for = "female" >
Female (2,000 calories)
< / label >
< div >
< input type = "radio" name = "sex" id = "male" value = "M" / >
< label for = "male" >
Male (2,500 calories)
< / label >
< / div >
< / div >
< / div >
< div class = "grid" id = "entries" >
Breakfast
< input
type="number"
min="0"
class="cal-control"
id="breakfast"
/>< br / >
Lunch
< input type = "number" min = "0" class = "cal-control" id = "lunch" / > < br / >
Dinner < input type = "number" min = "0" class = "cal-control" id = "dinner" / >
< / div >
< button type = "button" class = "btn-add" id = "add" >
Add Entry
< / button >
< button type = "submit" class = "btn-solid" id = "calculate" >
Calculate
< / button >
< button type = "button" class = "btn-outline" id = "clear" >
Clear
< / button >
< / form >
< div id = "output" > < / div >
< / div >
< / body >
< / html >
```
2020-11-27 18:02:05 +00:00
## --after-user-code--
2019-12-08 00:11:14 +00:00
```html
< / body >
< / html >
```
2020-11-27 18:02:05 +00:00
## --seed-contents--
2019-12-08 00:11:14 +00:00
2020-11-27 18:02:05 +00:00
```html
< script >
document.getElementById('calorie-form').onsubmit = calculate;
2019-12-08 00:11:14 +00:00
2020-11-27 18:02:05 +00:00
function calculate(e) {
e.preventDefault();
2019-12-08 00:11:14 +00:00
2020-11-27 18:02:05 +00:00
const total = Array.from(document.getElementsByClassName('cal-control'))
.map(meal => Number(meal.value))
.reduce((accumulator, currentValue) => accumulator + currentValue, 0);
const maxCalories = document.getElementById('female').checked;
}
< / script >
```
# --solutions--
2019-12-08 00:11:14 +00:00
```html
< script >
document.getElementById('calorie-form').onsubmit = calculate;
function calculate(e) {
e.preventDefault();
const total = Array.from(document.getElementsByClassName('cal-control'))
.map(meal => Number(meal.value))
.reduce((accumulator, currentValue) => accumulator + currentValue, 0);
const maxCalories = document.getElementById('female').checked ? 2000 : 2500;
}
< / script >
```
