What does the indexOf() method return if the element is not found in an array in JavaScript?Points:1-1null0undefinedI don't know

What does the following code log?var str = "Twice a day";var index = str.indexOf("a");var index2 = str.lastIndexOf("a");console.log(str.indexOf("a", index + 1) === index2);AtrueBfalse

How can you check if a variable is an array in JavaScript?OptionsUsing the Array.isArray() methodUsing the isarray() functionUsing the isArray() methodUsing the typeof operator

In general, the index of the first element in an array is __________Options-1021

How do you find the index of the first occurrence of an element in an array?Optionsfind(element)index(element)locate(element)search(element)

What is the output of the following TypeScript code?let arr = [1, 2, 3, 4];for (let i = 0; i < arr.length; i++) {    if (i === 2) continue;    console.log(arr[i]);}*1 point1 2 3 41 3 41 2 41 2 4 3