freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-some-method-to-check-that-any-elements-in-an-array-meet-a-criteria.english.md

id, title, challengeType, forumTopicId

id	title	challengeType	forumTopicId
587d7dab367417b2b2512b6f	Use the some Method to Check that Any Elements in an Array Meet a Criteria	1	301314

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:

var numbers = [10, 50, 8, 220, 110, 11];
numbers.some(function(currentValue) {
  return currentValue < 10;
});
// Returns 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.

Tests

tests:
  - text: Your code should use the <code>some</code> method.
    testString: assert(code.match(/\.some/g));
  - text: <code>checkPositive([1, 2, 3, -4, 5])</code> should return <code>true</code>.
    testString: assert(checkPositive([1, 2, 3, -4, 5]));
  - text: <code>checkPositive([1, 2, 3, 4, 5])</code> should return <code>true</code>.
    testString: assert(checkPositive([1, 2, 3, 4, 5]));
  - text: <code>checkPositive([-1, -2, -3, -4, -5])</code> should return <code>false</code>.
    testString: assert(!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.some(elem => elem > 0);
  // Only change code above this line
}
checkPositive([1, 2, 3, -4, 5]);