Category: JavaScript Answers

Sometimes, we want to compare two time strings in the format HH:MM:SS with JavaScript.

In this article, we’ll look at how to compare two time strings in the format HH:MM:SS with JavaScript.

How to compare two time strings in the format HH:MM:SS with JavaScript?

To compare two time strings in the format HH:MM:SS with JavaScript, we can compare the time strings directly if the strings are in 24 hour format and there’s no am or pm in them.

For instance, we write

const str1 = "10:20:45";
const str2 = "05:10:10";

if (str1 > str2) {
  console.log("Time 1 is later than time 2");
} else {
  console.log("Time 2 is later than time 1");
}

to compare str1 and str2 directly.

The strings are in 24 hour format and there’s no am or pm in them, so we can do the comparison directly.

Conclusion

To compare two time strings in the format HH:MM:SS with JavaScript, we can compare the time strings directly if the strings are in 24 hour format and there’s no am or pm in them.

Sometimes, we want to change CSS values with JavaScript.

In this article, we’ll look at how to change CSS values with JavaScript.

How to change CSS values with JavaScript?

To change CSS values with JavaScript, we can get the rule from document.styleSheets and set the rule’s values.

For instance, we write

const cssRuleCode = document.all ? "rules" : "cssRules";
const rule = document.styleSheets[styleIndex][cssRuleCode][ruleIndex];
rule.selectorText = selector;
rule.value = value;

to get the rule we want to update with document.styleSheets[styleIndex][cssRuleCode][ruleIndex].

Then we set the selector text of the rule with

rule.selectorText = selector;

And we set the value of the rule with

rule.value = value;

Conclusion

To change CSS values with JavaScript, we can get the rule from document.styleSheets and set the rule’s values.

Sometimes, we want to create a simple HTTP proxy in Node.js.

In this article, we’ll look at how to create a simple HTTP proxy in Node.js.

How to create a simple HTTP proxy in Node.js?

To create a simple HTTP proxy in Node.js, we can use the http and http-proxy modules.

We install http-proxy by running

npm install http-proxy --save

Then we use it by writing

const http = require("http");
const httpProxy = require("http-proxy");
const proxy = httpProxy.createProxyServer({});

http
  .createServer((req, res) => {
    proxy.web(req, res, { target: "http://www.example.com" });
  })
  .listen(3000);

to create a proxy server with createProxyServer.

Then we call http.createServer with a callback to proxy our requests to http://www.example.com.

And we listen for requests on port 3000.

Conclusion

To create a simple HTTP proxy in Node.js, we can use the http and http-proxy modules.

Sometimes, we want to convert timestamp to human readable format with JavaScript.

In this article, we’ll look at how to convert timestamp to human readable format with JavaScript.

How to convert timestamp to human readable format with JavaScript?

To convert timestamp to human readable format with JavaScript, we can use the date’s setTime method.

For instance, we write

const newDate = new Date();
newDate.setTime(unixtime * 1000);
const dateString = newDate.toUTCString();

to create a Date object.

Then we call setTime with unixtime * 1000 to set the timestamp of newDate to unixtime * 1000.

unixtime is the timestamp of the date in seconds.

then we call toUTCString to return a human readable date string from newDate.

Conclusion

To convert timestamp to human readable format with JavaScript, we can use the date’s setTime method.

Sometimes, we want to return data from axios API with JavaScript.

In this article, we’ll look at how to return data from axios API with JavaScript.

How to return data from axios API with JavaScript?

To return data from axios API with JavaScript, we can use the return statement.

For instance, we write

const axiosTest = async () => {
  const response = await axios.get(url);
  return response.data;
};

to define the axiosTest function that returns the response data from the axios.get method.

We call axios.get with url to return a promise with the response from making a get request to the url.

Then we return response.data to return the data.

Next, in an async function, we write

const data = await axiosTest();

to get the response data from axiosTest.

Conclusion

To return data from axios API with JavaScript, we can use the return statement.