- Write a JavaScript function to check whether an 'input' is an array or not.
toString.call(input) === '[object Array]';- Write a JavaScript function to clone an array.
arr.slice(0);- Write a JavaScript function to get the first element of an array. Passing a parameter 'n' will return the first 'n' elements of the array.
if (n === null) {
return arr[0];
} else {
arr.slice(0, n);
}- Write a JavaScript function to get the last element of an array. Passing a parameter 'n' will return the last 'n' elements of the array.
if (n === null) {
return arr[0];
} else {
arr.slice(0, n);
}