Category: JavaScript Answers

Sometimes, we want to set view width automatically by text inside with React Native.

In this article, we’ll look at how to set view width automatically by text inside with React Native.

How to set view width automatically by text inside with React Native?

To set view width automatically by text inside with React Native, we set the alignSelf style.

For instance, we write

<View style={{ backgroundColor: "#000000", alignSelf: "flex-start" }}>
  <Text style={{ color: "#ffffff" }}>Sample text here</Text>
</View>

to set the alignSelf style of the View to 'flex-start' to make it display as an inline-block component.

An inline-block component will be sized according to the width of its contents.

Conclusion

To set view width automatically by text inside with React Native, we set the alignSelf style.

Sometimes, we want to create empty array of a given size with JavaScript.

In this article, we’ll look at how to create empty array of a given size with JavaScript.

How to create empty array of a given size with JavaScript?

To create empty array of a given size with JavaScript, we use the Array constructor.

For instance, we write

const arr = Array(5);
console.log(arr.length);

to call Array with 5 to return an array with 5 empty slots.

Conclusion

To create empty array of a given size with JavaScript, we use the Array constructor.

Sometimes, we want to bind function arguments without binding this with JavaScript.

In this article, we’ll look at how to bind function arguments without binding this with JavaScript.

How to bind function arguments without binding this with JavaScript?

To bind function arguments without binding this with JavaScript, we return a function that calls the function that we want to bind the arguments with.

For instance, we write

const bindArgs = (func, ...boundArgs) => {
  return (...args) => {
    return func(...boundArgs, ...args);
  };
};

const deleteGroup = bindArgs(deleteGroup, "groupName1");

to create the bindArgs function that returns a function that calls func with the arguments from the boundArgs array and the args that we pass into the function returned by bindArgs.

Then we call bindArgs with the deleteGroup and args being an array with 'groupName1'.

Conclusion

To bind function arguments without binding this with JavaScript, we return a function that calls the function that we want to bind the arguments with.

To return values from async functions using async-await from function with JavaScript, we return the resolve value of the promise.

For instance, we write

const getData = async () => {
  const { data } = await axios.get(
    "https://jsonplaceholder.typicode.com/posts"
  );
  return data;
};

(async () => {
  console.log(await getData());
})();

to create the getData function that gets the resolve value of the promise returned by axios.get with await.

We extract the data property from the object returned by the promise and return it.

We then use await with getData to get the resolve value of the promise that was returned with return in getData.

Sometimes, we want to import module with a variable name in Node.js.

In this article, we’ll look at how to import module with a variable name in Node.js.

How to import module with a variable name in Node.js?

To import module with a variable name in Node.js, we can call the import function.

For instance, we write

const importModule = async () => {
  try {
    const module = await import("./path/module.js");
  } catch (error) {
    console.error("import failed");
  }
};

to call import with the path string to the module.

It returns a promise with the module that we imported.

So we get the module with await.

Conclusion

To import module with a variable name in Node.js, we can call the import function.