freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/functional-programming/use-the-every-method-to-check-that-every-element-in-an-array-meets-a-criteria/index.md

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Use the every Method to Check that Every Element in an Array Meets a Criteria

Use the every Method to Check that Every Element in an Array Meets a Criteria

Problem Explanation:

Use the every method inside the checkPositive function to check if every element in arr is positive. The function should return a Boolean value.

Relevant Links:

• Array.prototype.every()

Hint

Don't forget return.

Solution

function checkPositive(arr) {
  // Add your code below this line
  
  return arr.every(val => val > 0);
  // Add your code above this line
}
checkPositive([1, 2, 3, -4, 5]);

Alternative Solution

function checkPositive(arr) {
  // Add your code below this line
    return arr.every(function(value) {
        return value > 0;
    });
  // Add your code above this line
}
checkPositive([1, 2, 3, -4, 5]);