Author: John Au-Yeung

Sometimes, we want to merge two JavaScript objects together in ES6+.

In this article, we’ll look at how to merge two JavaScript objects together in ES6+.

How to merge two JavaScript objects together in ES6+?

To merge two JavaScript objects together in ES6+, we use the object spread syntax.

For instance, we write

const merged = { ...obj1, ...obj2 };

to merge the properties of obj1 and obj2 into a new object.

A shallow copy of obj1 and obj2 are made before their contents are put in the new object.

Conclusion

To merge two JavaScript objects together in ES6+, we use the object spread syntax.

Sometimes, we want to put a clear button inside a HTML text input box.

In this article, we’ll look at how to put a clear button inside a HTML text input box.

How to put a clear button inside a HTML text input box?

To put a clear button inside a HTML text input box, we add an input with type attribute set to search.

For instance, we write

<input type="search" placeholder="Search..." />

to add the input with type set to search to make the clear button show on the right end of the input box.

Conclusion

To put a clear button inside a HTML text input box, we add an input with type attribute set to search.

Sometimes, we want to download data URL file with JavaScript.

In this article, we’ll look at how to download data URL file with JavaScript.

How to download data URL file with JavaScript?

To download data URL file with JavaScript, we can create an anchor element that links to the file.

And then we call click to click the link.

For instance, we write

const download = (dataUrl, filename) => {
  const link = document.createElement("a");
  link.href = dataUrl;
  link.download = filename;
  link.click();
};

download("data:text/html,HelloWorld!", "helloWorld.txt");

to create the download function that creates an anchor element with createElement.

Then we set its href attribute to dataUrl.

And we set the download attribute to the file name of the downloaded file.

Then we call click to download the file.

Conclusion

To download data URL file with JavaScript, we can create an anchor element that links to the file.

And then we call click to click the link.

Sometimes, we want to add a fixed footer with React Native.

In this article, we’ll look at how to add a fixed footer with React Native.

How to add a fixed footer with React Native?

To add a fixed footer with React Native, we can use the ScrollView.

For instance, we write

<View style={{ flex: 1 }}>
  <ScrollView>main</ScrollView>
  <View>
    <Text>footer</Text>
  </View>
</View>

to add a ScrollView that lets us scroll through overflow content.

And we add the footer with

<View>
  <Text>footer</Text>
</View>

We set flex to 1 in the style prop of the outer View to make the flex direction vertical so the items inside will be arranged vertically.

Conclusion

To add a fixed footer with React Native, we can use the ScrollView.

Sometimes, we want to stop a JavaScript for loop.

In this article, we’ll look at how to stop a JavaScript for loop.

How to stop a JavaScript for loop?

To stop a JavaScript for loop, we can use the break keyword.

For instance, we write

let arr = [1, 2, 3, 4, 5];
for (let ele of arr) {
  if (ele > 3) {
    break;
  }
  console.log(ele);
}

to add a for of loop to loop through the items in the arr array.

In it, we check if the ele variable, which is the item being looped through, is bigger than 3.

If it is, we use break to stop the loop.

Conclusion

To stop a JavaScript for loop, we can use the break keyword.