Author: John Au-Yeung

Sometimes, we want to partition an array in JavaScript.

In this article, we’ll look at how to partition an array in JavaScript.

How to partition an array in JavaScript?

To partition an array in JavaScript, we can use the Lodash chunk function.

For instance, we write:

const arrayAll = [1, 2, 3, 4, 5, 6, 7, 8, 9]
const chunked = _.chunk(arrayAll, 3)
console.log(chunked)

to call chunk with arrayAll and 3 to return an array with entries in arrayAll divided into chunks of 3.

As a result, chunked is:

[[1, 2, 3], [4, 5, 6], [7, 8, 9]]

Conclusion

To partition an array in JavaScript, we can use the Lodash chunk function.

Sometimes, we want to get the URL parameters inside the HTML page with JavaScript.

In this article, we’ll look at how to get the URL parameters inside the HTML page with JavaScript.

How to get the URL parameters inside the HTML page with JavaScript?

To get the URL parameters inside the HTML page with JavaScript, we can use the URLSearchParams constructor.

For instance, we write:

const params = new URLSearchParams(document.location.search);
const s = params.get("s");
const o = params.get("o");
console.log(s, o)

to create a URLSearchParams instance with the query string of the current page URL, which we get from document.location.search.

Next, we get the value of the s and o query parameters with params.get.

Therefore, if the current page URL has the query string s=1&o=2, then s is 1, and o is 2.

Conclusion

To get the URL parameters inside the HTML page with JavaScript, we can use the URLSearchParams constructor.

Sometimes, we want to decode a base64 string using CryptoJS with JavaScript.

In this article, we’ll look at how to decode a base64 string using CryptoJS with JavaScript.

How to decode a base64 string using CryptoJS with JavaScript?

To decode a base64 string using CryptoJS with JavaScript, we can use the CryptoJS.enc.Base64.parse method.

For instance, we write:

const base64 = 'SGVsbG8gd29ybGQ=';
const words = CryptoJS.enc.Base64.parse(base64);
const textString = CryptoJS.enc.Utf8.stringify(words);
console.log(textString)

We call CryptoJS.enc.Base64.parse with the base64 string to parse the base64 string.

Then we call CryptoJS.enc.Utf8.stringify to convert the decrypted words into a string.

Therefore, textString is 'Hello world'.

Conclusion

To decode a base64 string using CryptoJS with JavaScript, we can use the CryptoJS.enc.Base64.parse method.

Sometimes, we want to detect iPad Pro as iPad with JavaScript.

In this article, we’ll look at how to detect iPad Pro as iPad with JavaScript.

How to detect iPad Pro as iPad with JavaScript?

To detect iPad Pro as iPad with JavaScript, we can check various properties of navigator.

For instance, we write:

const isIOS = () => {
  if (/iPad|iPhone|iPod/.test(navigator.platform)) {
    return true;
  } else {
    return navigator.maxTouchPoints &&
      navigator.maxTouchPoints > 2 &&
      /MacIntel/.test(navigator.platform);
  }
}

const isIpadOS = () => {
  return navigator.maxTouchPoints &&
    navigator.maxTouchPoints > 2 &&
    /MacIntel/.test(navigator.platform);
}

to define the isIOS and isIpadOS functions to check whether the device runs iOS or iPad OS.

In isIOS, we check navigator.platform or check whether there’re more than 2 touch points max supported by the device.

In isIpadOS, we just check whether the max number of touch points.

Conclusion

To detect iPad Pro as iPad with JavaScript, we can check various properties of navigator.