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Using the every Method in an array

 3 years ago
source link: https://dev.to/rthefounding/using-the-every-method-in-an-array-1j64
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Using the every Method in an array

Jul 9

・1 min read

  • The 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.

  • Example, the following code would check if every element in arr is positive.

function check(arr) {
return arr.every(function(num) {
  return num > 0;
})

}
console.log(check([1, 2, 3, -4, 5]));
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  • check([1, 2, 3, -4, 5]) should return false

Using the some Method

  • 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.
function check(arr) {
return arr.some(function(num) {
  return num > 0;
})

}
console.log(check([1, 2, 3, -4, 5]));
// would return true
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