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Arrays

Copy array

const arr1 = ['JAN', 'FEB', 'MAR', 'APR', 'MAY'];
let arr2;

(function() {
  arr2 = arr1; // Copy array instance
  arr1[0] = 'potato'
})();

console.log(arr2);

Output:

["potato", "FEB", "MAR", "APR", "MAY"]

Copy array elements (Spread Operator)

const arr1 = ['JAN', 'FEB', 'MAR', 'APR', 'MAY'];
let arr2;

(function() {
  arr2 = [...arr1]; // Spread Operator - Copy array elements
  arr1[0] = 'potato'
})();

console.log(arr2);

Output:

["JAN", "FEB", "MAR", "APR", "MAY"]