Javascript Array Helper Methods

Question 1

Joins two or more arrays and returns a copy of the joined arrays?

Answer 1

.concat()

Question 2

Copies array elements within the array, to and from specified positions?

Answer 2

var fruits = [“Banana”, “Orange”, “Apple”, “Mango”, “Kiwi”, “Papaya”];

fruits. copyWithin(2,0,2);
results: Banana,Orange,Banana,Orange,Kiwi,Papaya

Question 3

Checks if every element in array passes a test?

Answer 3

every()
var ages = [32, 33, 16, 40];

function checkAdult(age) {
    return age >= 18;
}

function myFunction() {
    document.getElementById("demo").innerHTML = ages.every(checkAdult);
}
 returns false