freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-an.../functional-programming/use-the-some-method-to-chec...

78 lines
1.7 KiB
Markdown
Raw Normal View History

---
id: 587d7dab367417b2b2512b6f
title: Use the some Method to Check that Any Elements in an Array Meet a Criteria
challengeType: 1
forumTopicId: 301314
dashedName: use-the-some-method-to-check-that-any-elements-in-an-array-meet-a-criteria
---
# --description--
The `some` method works with arrays to check if *any* element passes a particular test. It returns a Boolean value - `true` if any of the values meet the criteria, `false` if not.
For example, the following code would check if any element in the `numbers` array is less than 10:
```js
var numbers = [10, 50, 8, 220, 110, 11];
numbers.some(function(currentValue) {
return currentValue < 10;
});
```
chore(learn): audit javascript algorithms and data structures (#41092) * chore(learn): audit basic algorithm scripting * chore(learn): audit basic data structures * chore(learn): audit basic javascript * chore(learn): audit debugging * chore(learn): audit es6 * chore(learn): audit functional programming * chore(learn): audit intermidate algorithms * chore(learn): audit js projects * chore(learn): audit object oriented programming * chore(learn): audit regex * fix(learn): remove stray . * fix(learn): string to code * fix(learn): missed some * fix(learn): clarify strings Based on Randy's feedback, clarifies string instances where quotes were removed in favour of back ticks. * fix: apply suggestions - thanks Randy! :) Co-authored-by: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> * fix: non-suggestion comments * chore(learn): remove comments from codes Removes the comments from the description and instruction code blocks to ensure that all relevant information is translatable. * fix: Apply suggestions from code review Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> * fix: revert crowdin fix * Update curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/mutations.md Co-authored-by: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> * fix: Apply suggestions from code review Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> * Update curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-assign-variables-from-arrays.md Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> * fix: Apply suggestions from code review Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com> Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> * chore: change voice * fix: Christopher Nolan * fix: expressions would evaluate * fix: will -> would * Update curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/add-methods-after-inheritance.md Co-authored-by: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> * fix: to work to push * Update curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-with-javascript-for-loops.md Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> * Update curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/add-methods-after-inheritance.md Co-authored-by: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> Co-authored-by: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>
2021-03-03 00:12:12 +00:00
The `some` method would return `true`.
# --instructions--
Use the `some` method inside the `checkPositive` function to check if any element in `arr` is positive. The function should return a Boolean value.
# --hints--
Your code should use the `some` method.
```js
assert(code.match(/\.some/g));
```
`checkPositive([1, 2, 3, -4, 5])` should return `true`.
```js
assert(checkPositive([1, 2, 3, -4, 5]));
```
`checkPositive([1, 2, 3, 4, 5])` should return `true`.
```js
assert(checkPositive([1, 2, 3, 4, 5]));
```
`checkPositive([-1, -2, -3, -4, -5])` should return `false`.
```js
assert(!checkPositive([-1, -2, -3, -4, -5]));
```
# --seed--
## --seed-contents--
```js
function checkPositive(arr) {
// Only change code below this line
// Only change code above this line
}
checkPositive([1, 2, 3, -4, 5]);
```
# --solutions--
```js
function checkPositive(arr) {
// Only change code below this line
return arr.some(elem => elem > 0);
// Only change code above this line
}
checkPositive([1, 2, 3, -4, 5]);
```