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Answer 1

Nothing special - indexOf() will return -1 in case of mismatch, not false or zero because we need zero just in case that was catched by QA. Honestly in ES6/ES7 world we already have includes() that will fit better in our case - we don't need to know substring position, just is it included or not. Or maybe RegExp with special flag that will ignore case. But because of initial requirenments my answer is:

function validateString(str) {
    if (str.toLowerCase().indexOf('superman') === -1) {
 throw new Error('String does not contain superman');

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Question 1: Suppose you have a webpage that contains the following IMG tag.

<img id=”myimage” src=”https://hashtag-labs.com/banner.jpeg” width=”300” height=”250” />

You can assume that any other HTML on this webpage is unknown, but valid.

Write a short script that does the following:

• Every 2 seconds
• If 100% of the image’s pixels are inside the browser viewport