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Tutor profile: Chaim F.

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Chaim F.
Senior Software Engineer
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Questions

Subject: Web Development

TutorMe
Question:

What is one of the ways a webpage's performance can be improved?

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Chaim F.
Answer:

We can use caching to improve the performance of a webpage. If for example this webpage is displaying data that is not frequently updated, there is no reason to need to go all the way to the database to get the data again as this can take pretty long. Instead we can keep this data closer like maybe in ram, or something like redis, this allows the webpage to display the data with less work resulting in faster load times.

Subject: Javascript Programming

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Question:

What is hoisting in JavaScript?

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Chaim F.
Answer:

If say for example I call a function before it is defined, in JavaScript this would be work because of hoisting. Here is an example. callme() function callme() { console.log("I work") } This works even though we are calling the function before it is defined. The reason this works is because JavaScript will actually "hoist" the function to the top of the file during the execution faze which means that by the time the function is called it is in fact defined before it is called.

Subject: CSS

TutorMe
Question:

What is an example of specificity in CSS?

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Chaim F.
Answer:

Let's imagine you had an h1 element like so <h1 class="sample">Hello world</h1> Now we had a css rule that looks like this. h1 { color: "red"; } and then we had another rule that looks like this .sample { color: "blue" } So here we now have a clash. With one rule, we are calling for the h1 to be red, and then with the other rule we call for it to be blue. In this case the result will be that the h1 will in fact be blue because the rule that says it should be red is targeting all h1's making very broad, but the rule that says it should be blue targets only items that have that class making it more specific.

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