The Array every() method executes a function for each array element, returning true if the function returns true for all elements or false if the function returns false for at least one element.

<!-- html element to place output -->
<p id="my_ages"></p>

// array
let ages = [9, 23, 33, 43];

// function to run
function check_ages(age) {
    return age >= 18;
}

// output true or false to the HTML element
document.getElementById('my_ages').innerHTML = 'It is ' + ages.every(check_ages) + ' that all ages in the array are 18 and older.';

The way this works (see Syntax section below):

• The every() method cycles through the items in the array and uses the function to determine if all of the ages are greater than or equal to 18; if so, the output is true; if not, the output is false

It is false that all ages in the array are 18 and older.

array.every(function(currentValue, index, arr), thisValue)

Parameter	Description
function()	A function to be run for each element in the array (required)
currentValue	The value of the current element (required)
index	The index of the current element
arr	The array of the current element
thisValue	A value passed to the function as its "this" value (default is undefined)

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