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add-elements-to-the-end-of-an-array-using-concat-instead-of-push.english.md
apply-functional-programming-to-convert-strings-to-url-slugs.english.md
avoid-mutations-and-side-effects-using-functional-programming.english.md
combine-an-array-into-a-string-using-the-join-method.english.md
combine-two-arrays-using-the-concat-method.english.md
implement-map-on-a-prototype.english.md
implement-the-filter-method-on-a-prototype.english.md
introduction-to-currying-and-partial-application.english.md
learn-about-functional-programming.english.md
pass-arguments-to-avoid-external-dependence-in-a-function.english.md
refactor-global-variables-out-of-functions.english.md
remove-elements-from-an-array-using-slice-instead-of-splice.english.md
return-a-sorted-array-without-changing-the-original-array.english.md
return-part-of-an-array-using-the-slice-method.english.md
sort-an-array-alphabetically-using-the-sort-method.english.md
split-a-string-into-an-array-using-the-split-method.english.md
understand-functional-programming-terminology.english.md
understand-the-hazards-of-using-imperative-code.english.md
use-higher-order-functions-map-filter-or-reduce-to-solve-a-complex-problem.english.md
use-the-every-method-to-check-that-every-element-in-an-array-meets-a-criteria.english.md
use-the-filter-method-to-extract-data-from-an-array.english.md
use-the-map-method-to-extract-data-from-an-array.english.md
use-the-reduce-method-to-analyze-data.english.md
use-the-some-method-to-check-that-any-elements-in-an-array-meet-a-criteria.english.md
intermediate-algorithm-scripting
javascript-algorithms-and-data-structures-projects
object-oriented-programming
regular-expressions
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04-data-visualization
05-apis-and-microservices
06-quality-assurance
07-scientific-computing-with-python
08-data-analysis-with-python
09-information-security
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bd68b70f3d
* fix: remove isHidden flag from frontmatter * fix: add isUpcomingChange Co-authored-by: Ahmad Abdolsaheb <ahmad.abdolsaheb@gmail.com> * feat: hide blocks not challenges Co-authored-by: Ahmad Abdolsaheb <ahmad.abdolsaheb@gmail.com> Co-authored-by: Ahmad Abdolsaheb <ahmad.abdolsaheb@gmail.com>
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id, title, challengeType, forumTopicId
| id | title | challengeType | forumTopicId |
|---|---|---|---|
| 587d7dab367417b2b2512b6e | Use the every Method to Check that Every Element in an Array Meets a Criteria | 1 | 301312 |
Description
every method works with arrays to check if every element passes a particular test. It returns a Boolean value - true if all values meet the criteria, false if not.
For example, the following code would check if every element in the numbers array is less than 10:
var numbers = [1, 5, 8, 0, 10, 11];
numbers.every(function(currentValue) {
return currentValue < 10;
});
// Returns false
Instructions
every method inside the checkPositive function to check if every element in arr is positive. The function should return a Boolean value.
Tests
tests:
- text: Your code should use the <code>every</code> method.
testString: assert(code.match(/\.every/g));
- text: <code>checkPositive([1, 2, 3, -4, 5])</code> should return <code>false</code>.
testString: assert.isFalse(checkPositive([1, 2, 3, -4, 5]));
- text: <code>checkPositive([1, 2, 3, 4, 5])</code> should return <code>true</code>.
testString: assert.isTrue(checkPositive([1, 2, 3, 4, 5]));
- text: <code>checkPositive([1, -2, 3, -4, 5])</code> should return <code>false</code>.
testString: assert.isFalse(checkPositive([1, -2, 3, -4, 5]));
Challenge Seed
function checkPositive(arr) {
// Only change code below this line
// Only change code above this line
}
checkPositive([1, 2, 3, -4, 5]);
Solution
function checkPositive(arr) {
// Only change code below this line
return arr.every(num => num > 0);
// Only change code above this line
}
checkPositive([1, 2, 3, -4, 5]);