对如何将数组中的值与另一个变量一起使用感到困惑

var array = [1, 2, 3, 4, 5];
var anotherVariable = 10;

for (var i = 0; i < array.length; i++) {
  var result = array[i] + anotherVariable;
  console.log(result);
}

var array = [1, 2, 3, 4, 5];
var anotherVariable = 10;

var result = array[2] + anotherVariable;
console.log(result);

var array = [1, 2, 3, 4, 5];
var anotherVariable = 10;

var newArray = array.map(function(element) {
  return element + anotherVariable;
});

console.log(newArray);

var array = [1, 2, 3, 4, 5];
var [firstValue, secondValue, thirdValue, ...rest] = array;
var anotherVariable = 10;

var result = firstValue + anotherVariable;
console.log(result);