Category: JavaScript

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JavaScript Answers

How to get element of JavaScript object with an index?

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Sometimes, we want to get element of JavaScript object with an index.

In this article, we’ll look at how to get element of JavaScript object with an index.

How to get element of JavaScript object with an index?

To get element of JavaScript object with an index, we use the Object.keys method to get an array of keys from the object and sort it.

For instance, we write

const myObj = { A: ["Abe"], B: ["Bob"] };
const sortedKeys = Object.keys(myObj).sort();
const first = myObj[sortedKeys[0]];

to get the keys in myObj as an array of strings with Object.keys.

Then we call sort to sort the key strings in alphabetical order.

Next, we get the first key in sortedKeys with sortedKeys[0].

And then we get the value of the property with myObj[sortedKeys[0]].

Conclusion

To get element of JavaScript object with an index, we use the Object.keys method to get an array of keys from the object and sort it.

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Vue Answers

How to import functions from different JavaScript file in a Vue Webpack project?

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Sometimes, we want to import functions from different JavaScript file in a Vue Webpack project.

In this article, we’ll look at how to import functions from different JavaScript file in a Vue Webpack project.

How to import functions from different JavaScript file in a Vue Webpack project?

To import functions from different JavaScript file in a Vue Webpack project, we use import.

For instance, we write

<script>
import test from "@/mylib";

console.log(test.foo());
//...
</script>

to import the mylib module’s default export as test.

Then we call the test.foo method.

@ is the alias for the src folder in the Vue project.

Conclusion

To import functions from different JavaScript file in a Vue Webpack project, we use import.

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JavaScript Answers

How to send flash messages in Express and JavaScript?

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Sometimes, we want to send flash messages in Express and JavaScript.

In this article, we’ll look at how to send flash messages in Express and JavaScript.

How to send flash messages in Express and JavaScript?

To send flash messages in Express and JavaScript, we use the connect-flash package.

To install it, we run

npm i connect-flash

Then we use it by writing

const express = require("express");
const flash = require("connect-flash");

const app = express();

app.use(flash());

//...

app.all("/", (req, res) => {
  req.flash("test", "it worked");
  res.redirect("/test");
});

We add the flash middleware with app.use.

Then we send our flash message with req.flash.

Conclusion

To send flash messages in Express and JavaScript, we use the connect-flash package.

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React Answers

How to map through an object in React?

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Sometimes, we want to map through an object in React.

In this article, we’ll look at how to map through an object in React.

How to map through an object in React?

To map through an object in React, we use some object methods.

For instance, we write

const Comp = () => {
  //...

  return (
    <>
      {Object.keys(subjects).map((keyName, i) => (
        <li className="travelcompany-input" key={i}>
          <span className="input-label">
            key: {i} Name: {subjects[keyName]}
          </span>
        </li>
      ))}
    </>
  );
};

to call Object.keys with the subjects object to return an array of property keys from subjects.

Then we call map with a function that returns a span for each property keyName.

And we render the property value with subjects[keyName].

Conclusion

To map through an object in React, we use some object methods.

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JavaScript Answers

How to create string with multiple spaces in JavaScript?

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Sometimes, we want to create string with multiple spaces in JavaScript.

In this article, we’ll look at how to create string with multiple spaces in JavaScript.

How to create string with multiple spaces in JavaScript?

To create string with multiple spaces in JavaScript, we use &nbsp.

For instance, we write

const str = "hello" + "&nbsp &nbsp &nbsp &nbsp &nbsp" + "world";

to add 5 spaces to the str string with "&nbsp &nbsp &nbsp &nbsp &nbsp".

Conclusion

To create string with multiple spaces in JavaScript, we use &nbsp.