You can use the following javascript code to change the background of a div class when a dark mode button is clicked on:

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//Put this code in a document.ready
const darkModeButton = document.querySelector("#dark-mode-button");

darkModeButton.addEventListener("click", ()=> {
    //change the background of the div class with class of "darkMode."
    document.querySelector(".darkMode").style.background = "black";
});

In order to make an image into a circle, you will need to use HTML, CSS, and some javascript.

Using HTML, you will need to create a div where the image will be housed:

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<div class="image-container"></div>

Using CSS, you will need to set the border-radius of the div to 50%:

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.image-container {
  border-radius: 50%;
}

Finally, using some javascript, you'll need to set the background image attribute of the div to the image you want to use:

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let pathToImage = 'images/profile.png';
document.querySelector('.image-container').style.backgroundImage = `url(${pathToImage})`;

For more information on how to make an image into a circle, please refer to this guide.

The code is written in JavaScript and makes use of DOM-related functions, such as document.querySelector to access and manipulate elements of the DOM.

The search() function is being triggered when the user submits the form, indicated by the event listener form.addEventListener set to submit. The purpose of the function is to take the value from the input with the id="city-input" and store it. The event.preventDefault() is then used to actually prevent the form from submitting, since we want to manage the input with JavaScript logic first.

When the value is stored, a conditional is used to check whether the input is empty or not. If it is empty, an alert of the value will be triggered. Otherwise, the innerHTML of h5 is changed to the value of the input.

This is how the code works overall.

For more information on how events work in JavaScript, you can refer to this link.

The code is written in JavaScript and makes use of DOM-related functions, such as document.querySelector to access and manipulate elements of the DOM.

The search() function is being triggered when the user submits the form, indicated by the event listener form.addEventListener set to submit. The purpose of the function is to take the value from the input with the id="city-input" and store it. The event.preventDefault() is then used to actually prevent the form from submitting, since we want to manage the input with JavaScript logic first.

When the value is stored, a conditional is used to check whether the input is empty or not. If it is empty, an alert of the value will be triggered. Otherwise, the innerHTML of h5 is changed to the value of the input.

This is how the code works overall.

For more information on how events work in JavaScript, you can refer to this link.

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function travel() {
    let name = prompt("What is your name?");
    let email = prompt("What is your email?");
    let travel = prompt("Do you enjoy traveling?");

    if (travel === "yes") {
        alert("Thank you " + name + "! I'll be in touch via email 😁");
    }
    else if (travel !== "yes") 
        alert("Thank you " + name + "! We won't bother you with emails at the moment, but if you change your mind, let us know!");
}

An if/else statement is a control flow statement in many programming languages which allows for code to be executed conditionally. For example, in JavaScript:

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if (x > 0) {
  console.log('x is greater than 0')
} else {
  console.log('x is not greater than 0')
}

For more information, please see the Mozilla documentation.

This can be done in various programming languages. Here is an example in JavaScript:

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function celsiusToFahrenheit(celsius) {
  return celsius * (9/5) + 32; 
}
let fahrenheitTemp = celsiusToFahrenheit(30); // 86

References: Celsius to Fahrenheit Conversion in JavaScript

The <a> element is used to link to other webpages while the <button> element is used to trigger a JavaScript action. The <a> tag can be styled to look like a button with CSS and HTML, however, you don't actually have control over how it behaves as a button and there is no guarantee across all browsers that it will consistently look and behave like a button. This is why sometimes it is necessary to use the <button> tag so that you can have more control over how the button looks and behaves.

You can use forEach() in order to iterate over all the values nested in objects in an array using JavaScript.

Here's an example that shows how to use forEach() to iterate over object values nested in an array:

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let arr = [
    {
        key1: "value1",
        key2: "value2"
    },
    {
        key1: "value3",
        key2: "value4"
    }
];

arr.forEach(obj => {
    console.log(obj.key1);
    console.log(obj.key2);
});

// Output:
// value1
// value2
// value3
// value4

In JavaScript, the variables are declared using the keyword var and value is assigned using = operator. For example,

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var x = 10; 

Here, x is a variable and 10 is the value stored in the variable. To print out the value stored in x to the console, we can use the console.log() method as shown below:

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console.log(x); 
// output: 10

For more information, read this article on how to store values into a variable in JavaScript.

You can use the Array.prototype.includes() method to compare elements from an array and add conditions accordingly.

For example, using JavaScript:

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let arr = [1, 2, 3, 4, 5];

if (arr.includes(3)) {
  console.log('3 is included')
}

More information about Array.prototype.includes() is available in MDN Web Docs for Array.prototype.includes().

In JavaScript, you can use the .toLowerCase() string method to convert a string to lowercase. For example:

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let message = "SheCodes ROCKS!";
let result = message.toLowerCase(); // result will be "shecodes rocks!"

Cookies can be used in JavaScript to store user information. To use them, you'll first have to create the cookie on the server side and then use the JavaScript document.cookie property to get, set, and delete the cookie.

To set a cookie in JavaScript, you can use the document.cookie property like this:

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document.cookie = "name=value;expires=date";

To get the cookie, use the following code:

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var name = document.cookie.split('=')[0];

To delete the cookie, use the following code:

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document.cookie = "name=; expires=Thu, 01 Jan 1970 00:00:00 UTC";

For more information on how to use cookies in JavaScript, check out this tutorial.

In some programming languages, two exclamation marks before a variable mean "not". It is an operator used to negate the value of a boolean expression i.e. it will evalute the expression to the opposite of its normal truth value.

For example, in JavaScript:

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let a = true;
let b = !!a;
console.log(b); // --> true

In the code example above, the first let statement sets a value of true. Then, the two exclamation marks before the a negates the value, and b is set as true.

The following code functions as a date formatter in Javascript:

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function formatDate(date) {
  const daysOfWeek = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
  const months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];

  const dayName = daysOfWeek[date.getDay()];
  const monthName = months[date.getMonth()];
  const day = date.getDate();
  const year = date.getFullYear();

  return `${dayName}, ${monthName} ${day}, ${year}`;
}

And here's an example of how to use it:

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// Output example: Thursday, April 4, 2020
let date = new Date(2020, 4, 4);
let formattedDate = formatDate(date);
console.log(formattedDate);

Removing elements from an array in most programming languages can typically be done with a remove or splice method. For example, in JavaScript, the splice method can be used to remove an element from an array:

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var letters = ["a", "b", "c" , "d"];

letters.splice(2,1);

// letters is now ["a", "b", "d"]

More details about the splice method can be found here.

Yes, you can add an href attribute to an element within an if statement in JavaScript. Here's an example:

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let someCondition = true;

if (someCondition) {
  let element = document.createElement('a');

  element.innerText = 'Click me';
  element.href = 'https://example.com/';

  document.querySelector('body').appendChild(element);
}

You need to use Javascript to add functionality to the HTML button. For example:

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function buttonClick() {
  if (condition) {
    window.location.href = "https://example.com/";
  }
}

Then add the onclick attribute to the button element in HTML:

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<button type="button" onclick="buttonClick()">Go to Link</button>

You can learn more about HTML and Javascript from the MDN Web Docs.

Removing items from an array depends on the programming language you are using. For example, in JavaScript you can use .splice() to remove items from an array:

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const myArray = [1,2,3,4];
myArray.splice(2, 1); // remove item with index 2
console.log(myArray); // [1,2,4]

For more specific implementation, you can refer to the documentation for the specific language you are using. For more detailed information, you can check out MDN's page on Array.prototype.splice() and read up on the different arguments you can pass in.

Console logging is a way to print out debugging information to the console window in most modern web browsers. To console log, you can use the console.log() method. For example, in JavaScript you can use the following code to print a message to the console window:

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console.log('This message will display in the console');

To add a property to an object, you can use the dot notation or the square bracket notation.

Using the dot notation, you can directly assign a value to the property as follows:

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// Dot notation
const obj = {};
obj.propName = 'Property value';

Using the square bracket notation, you can include variables and reserved words in the name of an object's property by wrapping the name of the property with quotes as follows:

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// Square bracket notation
const obj = {};
const propName = 'key';
obj[propName] = 'Property value';

For more information, see this article.

To select text in JavaScript, you can use the window.getSelection() method. This will create a Selection object which you can then use to set the start and end of the selection and make other modifications. A demo can be found here.

In the HTML <span> tag, you can specify font-weight with the style attribute. For example, if you wanted to have your font weight be bold, you would write <span style="font-weight: bold">. If you are using a host of web languages such as HTML with CSS and JavaScript, you can specify font-weight in the style tags that are linked to the page. For example, if you wanted a section of text to be bold you would write something like this:

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.example {
    font-weight: bold;
}

and

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<span class="example">Text to be bold</span>

You can also use certain numerical values if you need a specific font weight. For example, 800 would result in a font weight of 800% or "extra-bold". A list of numerical values for font weights can be found here.

In JavaScript, you can use Math.floor() to round a number down to its nearest integer.

For example:

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let x = 7.82
Math.floor(x) // returns 7

For more information, please see the MDN documentation on Math.floor().

In JavaScript, the Math.round() method can be used to round a number to the nearest integer. For example:

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let num = 1.24;
let roundedNum = Math.round(num);

console.log(roundedNum); // 1

More information on the Math.round() method can be found here.