Category: JavaScript Answers

Sometimes, we want to get rid of X-Powered-By response header in Node.js Express and JavaScript.

In this article, we’ll look at how to get rid of X-Powered-By response header in Node.js Express and JavaScript.

How to get rid of X-Powered-By response header in Node.js Express?

To get rid of X-Powered-By response header in Node.js Express, we can use the app.disable method.

For instance, we write

app.disable('x-powered-by');

to disable the 'x-powered-by' option which removes the X-Powered-By response header in our Express app.

Conclusion

To get rid of X-Powered-By response header in Node.js Express, we can use the app.disable method.

Sometimes, we want to replace a text node with HTML text in JavaScript.

In this article, we’ll look at how to replace a text node with HTML text in JavaScript.

How to replace a text node with HTML text in JavaScript?

To replace a text node with HTML text in JavaScript, we can set the innerHTML property of the element to the HTML we want.

For instance, we write:

<span>
  https://example.com
</span>

to add a span.

Then we replace the HTML inside the span by writing:

const span = document.querySelector('span')
span.innerHTML = `<a href='${span.textContent}'>${span.textContent}</a>`

We get the span with querySelector.

Then we set the innerHTML property of the span to the HTML we want to replace it with.

As a result, we see the link rendered in the span.

Conclusion

To replace a text node with HTML text in JavaScript, we can set the innerHTML property of the element to the HTML we want.

Sometimes, we want to detect Ctrl + A press in a keyup event with JavaScript.

In this article, we’ll look at how to detect Ctrl + A press in a keyup event with JavaScript.

How to detect Ctrl + A press in a keyup event with JavaScript?

To detect Ctrl + A press in a keyup event with JavaScript, we can set the document.onkeyup property to a function that checks for the pressing ctrl+a key combo.

For instance, we write:

document.onkeyup = (e) => {
  if (e.ctrlKey && (e.keyCode == 65 || e.keyCode == 97)) {
    console.log('ctrl+a pressed')
  }
}

We set document.onkeyup to a function that checks if ctrl is pressed with e.ctrlKey.

And we check if the ‘a’ key is pressed with (e.keyCode == 65 || e.keyCode == 97).

If they’re both true, then we know ctrl+a is pressed.

Conclusion

To detect Ctrl + A press in a keyup event with JavaScript, we can set the document.onkeyup property to a function that checks for the pressing ctrl+a key combo.

Sometimes, we want to get the item that appears the most times in an array with JavaScript.

In this article, we’ll look at how to get the item that appears the most times in an array with JavaScript.

How to get the item that appears the most times in an array with JavaScript?

To get the item that appears the most times in an array with JavaScript, we can use some object and array methods.

For instance, we write:

const store = ['1', '2', '2', '3', '4', '5', '5']
const counts = {}
for (const s of store) {
  if (!counts[s]) {
    counts[s] = 1
  } else {
    counts[s]++
  }
}

const mostTimes = Math.max(...Object.values(counts))
const mostPopular = Object
  .entries(counts)
  .filter(([, count]) => count === mostTimes)
  .map(([key]) => key)
console.log(mostPopular)

We loop through each store entry and put the value as the keys of counts and the count of each value as the value.

Then we get the highest count by getting the property values of counts with Object.values.

And then we get the max value with Math.max and spreading the values from the array as arguments.

Next, we get the elements with the highest count with Object.entries to return the key-value pairs as an array of key-value pair arrays.

Then we call filter to get the items with count equals to mostTimes.

Finally, we call map to get the values with the highest count.

Therefore, mostPopular is ['2', '5'].

Conclusion

To get the item that appears the most times in an array with JavaScript, we can use some object and array methods.