JS every

The every() method checks if all elements in an array pass a test (provided as a function).

The every() method executes the function once for each element present in the array:

• If it finds an array element where the function returns a false value, every() returns false (and does not check the remaining values)
• If no false occur, every() returns true

Note: every() does not execute the function for array elements without values.

Note: every() does not change the original array

https://www.w3schools.com/jsref/jsref_every.asp

return true if all elements in array passes the check

 var a = [4,5,6];

undefined

a.every( (item) => {return item > 4})

false

var a = [5,6];

undefined

a.every( (item) => {return item > 4})

true