check if is array js

Array.isArray([1, 2, 3]);   // true
Array.isArray({toto: 123}); // false
Array.isArray("tototruc");  // false
Array.isArray(undefined);   // false

let fruit = 'apple';
let fruits = ["apple", "banana", "mango", "orange", "grapes"];

const isArray = (arr) => Array.isArray(arr);

console.log(isArray.(fruit)); //output - false
console.log(isArray.(fruits)); //output- true