NEW - Check out our NEW program SheCodes Bootcamp - and become a developer in just 4 months!
More
Learn more
how to uppercase just the first letter with .to command
You can use the toUpperCase() function in JavaScript to uppercase just the first letter as shown in the example below:
javascript Copy code
let text = "hello world";
let firstChar = text.charAt(0).toUpperCase();
let otherChars = text.slice(1).toLowerCase();
let result = firstChar + otherChars;
console.log(result); // Outputs: "Hello world"
how do I start running a function after one function is complete
One way to start running a function after another function has been completed is by using a callback function. This is a function that is passed as an argument to another function, with the intention of being executed once the other function has finished. An example in JavaScript would be:
js Copy code
function firstFunction(callback){
console.log('This is the first function');
callback();
}
function secondFunction(){
console.log('This is the second function');
}
firstFunction(secondFunction);
When running this example code, you would see the following in the console:
code Copy code
This is the first function
This is the second function
what is a listener?
A listener is a piece of code that is used to detect and respond to certain events such as button clicks, key presses, or other inputs.
In JavaScript, a listener is usually implemented as a function that is assigned as a callback to an event handler. This function is then invoked whenever that event occurs.
Here is an example of a listener in JavaScript:
javascript Copy code
const btn = document.querySelector('#some-button');
btn.addEventListener('click', (e) => {
console.log('The button was clicked!');
});
In this example, the addEventListener method is used to assign the function (e) => { console.log('The button was clicked!') } as a callback to listen for the click event on the button element. When that event occurs, the listener will be triggered, and our code inside the callback will be executed.
can i use a variable that is declared in a function, outside of the function?
In most programming languages, variables declared inside a function cannot be used outside of the function. This is because the variable is scoped within the functionโs block.
For example in JavaScript, a variable declared inside a function is only available within the scope of the function:
js Copy code
function myFunc() {
let myVar = 'my variable';
return 'foo';
}
console.log(myVar); // Uncaught ReferenceError: myVar is not defined
can I use a variable from a different function in a new function for the same declared value?
Yes, you can use a variable from a different function in a different function. To do so, you need to set the variable as global, for example in JavaScript:
js Copy code
let globalVariable = 0;
function functionOne () {
globalVariable = 3;
console.log('Declaring Global Variable in Function One');
console.log('globalVariable: '+globalVariable);
};
function functionTwo () {
console.log('Using Global Variable in Function Two');
console.log('globalVariable: '+globalVariable);
};
functionOne();
functionTwo();
Output: Declaring Global Variable in Function One globalVariable: 3 Using Global Variable in Function Two globalVariable: 3
More information about global variables and how to use them can be found here: https://www.w3schools.com/js/js_scope.asp.
in ocaml Use options to re-implement `assoc` with a more truthful type: let rec assoc : (key: 'k) (l : ('k * 'v) list) : 'v = begin match l with | [] -> failwith "Not_found" | (k2, v) :: tl -> if key = k2 then v else assoc key tl end
ocaml Copy code
let assoc key (l : ('k * 'v) list): 'v option =
let rec assoc' l =
begin match l with
| [] -> None
| (k2, v) :: tl -> if key = k2 then Some v else assoc' tl
end in
assoc' l
Can you show me the structure of the body which contains a GridSystem ?
The HTML code for the body containing a GridSystem is:
markup Copy code
<body>
<div class="row">
<div class="col-md-12">
Grid System goes here
</div>
</div>
</body>
The CSS code for the body containing a GridSystem is:
css Copy code
.row {
width: 100%;
display: flex;
flex-wrap: wrap;
justify-content: flex-start;
margin: 0 -15px;
}
.col-md-12 {
position: relative;
width: 100%;
flex: 0 0 100%;
padding: 0 15px;
}
The JavaScript code for the body containing a GridSystem is:
js Copy code
const gridSystem = document.getElementById("grid-system");
gridSystem.addEventListener("click", () => {
console.log("GridSystem clicked");
});
create an alert saying hello
javascript Copy code
alert("Hello");
why prettier asks me to close body
It is likely that your HTML code has an unclosed <div> or <body> tag. You can use a code editor, like Visual Studio Code (VSCode), to inspect your HTML file to identify and fix the closing tag issues.
After the user clicks on the Apply now button Ask for the personโs first name Ask for the personโs age If 18 or more, change the h1 to โHi, {Name}! Welcome to SheCodes !โ Otherwise change the h1 to โSorry, {Name}! You cannot join SheCodes โ
javascript Copy code
const button = document.querySelector("#apply");
button.addEventListener("click", event => {
const name = prompt("What is your first name?");
const age = prompt("How old are you?");
const h1 = document.querySelector("h1");
if (parseInt(age) >= 18) {
h1.textContent = `Hi, ${name}! Welcome to SheCodes !`;
} else {
h1.textContent = `Sorry, ${name}! You cannot join SheCodes `;
}
});
form that ask for information such as name, last name, and email address. submit button
html Copy code
<form action="" method="post">
<label>Name:</label><br>
<input type="text" name="name" placeholder="Your name" required><br>
<label>Last Name:</label><br>
<input type="text" name="lastname" placeholder="Your last name" required><br>
<label>Email:</label><br>
<input type="email" name="email" placeholder="Your email" required><br><br>
<input type="submit" value="Submit">
</form>
css Copy code
form {
padding: 1rem;
}
input[type="text"],
input[type="email"] {
display: block;
width: 100%;
padding: 0.8rem;
margin-bottom: 0.5rem;
font-size: 0.9rem;
border-radius: 0.3rem;
border: 1px solid rgba(0, 0, 0, 0.25);
}
input[type="submit"] {
background-color: #6F9EB6;
color: #FFF;
padding: 0.8rem 1.2rem;
font-size: 0.9rem;
border-radius: 0.3rem;
border: none;
}
How can I make the function be called ONLY when a specific button is clicked?
You can make a function be called only when a specific button is clicked using an event listener. Here's an example using JavaScript:
js Copy code
// Select the specific button
const myButton = document.querySelector('#myButton');
// Add an event listener to the button
myButton.addEventListener('click', myFunction);
// Define the function
function myFunction() {
console.log('Button was clicked.');
}
write code that displays the temperature of a city when we enter a city name in form.
HTML:
html Copy code
<form>
<label>
City:
<input type="text" id="city" name="city">
</label>
<br>
<button type="submit" onclick="getTemperature()">Check Temperature</button>
</form>
<p id="temperature"></p>
CSS:
css Copy code
form {
width: 250px;
margin: 0 auto
}
JavaScript:
javascript Copy code
function getWeather(city) {
fetch(`http://api.openweathermap.org/data/2.5/weather?q=${city}&appid=***********`)
.then((response) => response.json())
.then((data) => {
let temp = data.main.temp;
document.getElementById("temperature").innerHTML = `The temperature of ${city} is ${temp} K.`;
});
}
function getTemperature() {
let city = document.getElementById("city").value;
getWeather(city);
document.getElementById("city").value = "";
}
create the function getYears, which will calculate the maximum term of the loan (a whole number of years) based on the amount of the loan, the annual interest percentage and the limit of the client
js Copy code
function getYears(loanAmount, interestPercentage, clientLimit) {
// Formula: A = B * (1 + C) ^ X
// A = loanAmount
// B = loanAmount
// C = interestPercentage
// X = number of years
const B = loanAmount;
const C = interestPercentage/100;
const A = clientLimit;
let X;
// Calculate the maximum number of years
X = Math.log(A/B) / Math.log(1 + C);
// Return a whole number of years
return Math.floor(X);
}
is root.render() the same as function() in react?
No, root.render() is a method provided by ReactDOM that can be used to render React components to the DOM. The more generic function() refers to a JavaScript function, and is generally used in defining components.
Example:
javascript Copy code
// Defining a React component
function MyComponent(props) {
return (
<h1>Hello, {props.name}</h1>
);
}
// Rendering component to the DOM
ReactDOM.render(<MyComponent name="Athena" />, root);
How do you check an Array and return the null values; if an Array has null values
You can use Array.prototype.filter() to check if an array contains any null values. In the example below, a function isNotNull is used to check for and exclude any null values from the result of the filter() method.
javascript Copy code
let arr = [null, undefined, 1, 8, 4, 3, null];
let isNotNull = value => value != null;
let filteredArray = arr.filter(isNotNull);
console.log(filteredArray);
// Output: [undefined, 1, 8, 4, 3]
how <strong> work?
It depends on what you are referring to. Please provide more information and specify the language or technology to get a clear answer.
The world clock
HTML
html Copy code
<!DOCTYPE html>
<html>
<head>
<title>World Clock</title>
</head>
<body>
<div id="time-wrapper">
<h2>The World Clock</h2>
<div id="time-holder">
<div>
<span>GMT: </span>
<span id="gmt"></span>
</div>
<div>
<span>CET: </span>
<span id="cet"></span>
</div>
<div>
<span>EST: </span>
<span id="est"></span>
</div>
</div>
</div>
</body>
</html>
CSS
css Copy code
#time-wrapper {
width: 250px;
margin: 20px auto;
border: 1px solid #ccc;
padding: 20px;
}
#time-holder {
margin-top: 10px;
}
#time-holder div {
margin-bottom: 8px;
}
JavaScript
js Copy code
function updateClock() {
const gmtTime = new Date().toUTCString();
const cetTime = new Date().toLocaleString('nl-NL', {timeZone: 'Europe/Berlin'});
const estTime = new Date().toLocaleString('nl-NL', {timeZone: 'America/New_York'});
document.getElementById('gmt').innerHTML = gmtTime;
document.getElementById('cet').innerHTML = cetTime;
document.getElementById('est').innerHTML = estTime;
}
setInterval(updateClock, 1000);
Your task is to create a function that does four basic mathematical operations. The function should take three arguments - operation(string/char), value1(number), value2(number). The function should return result of numbers after applying the chosen operation.
In JavaScript:
javascript Copy code
const calculate = (operation, value1, value2) => {
switch (operation){
case "+":
return value1 + value2;
case "-":
return value1 - value2;
case "*":
return value1 * value2;
case "/":
return value1 / value2;
default:
return "Operation not recognized"
}
}
calculate("+", 10, 5); // returns 15
calculate("-", 10, 5); // returns 5
calculate("*", 10, 5); // returns 50
calculate("/", 10, 5); // returns 2
calculate("^", 10, 5); // returns "Operation not recognized"
What does console.log do?
console.log() is a function in JavaScript that outputs a message to the console of a web browser.
Example:
javascript Copy code
console.log("Hello World")
This code would output "Hello World" to the browser console.
form validator for email
HTML
html Copy code
<form>
Email: <input type="text" name="email" id="email" />
<input type="button" value="submit" onclick="validate()" />
</form>
JavaScript
javascript Copy code
function validate(){
const email = document.getElementById('email').value
const regex = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/;
if(regex.test(email)) {
alert("Valid email!")
} else {
alert("Invalid email!")
}
}
CSS
css Copy code
input[type=text] {
padding: 5px;
border: 1px solid #ccc;
box-shadow: 2px 2px 5px #ccc;
}
what's a function
A function is a block of code that performs a specific task. It is usually used to execute a certain action with given parameters. In other words, it is a set of instructions written to perform a specific task. Here is an example of a JavaScript function:
javascript Copy code
function myFunction(x, y) {
return x + y;
}
The above code defines a function called "myFunction" that takes in two parameters (x, y) and returns the sum of x and y.
what is an object in js?
In Javascript, an object is a collection of key-value pairs that can contain data, functions or methods, and other objects.
Example:
js Copy code
const pet = {
name: 'Gizmo',
type: 'cat',
age: 7,
sound: () => {
console.log('Meow!');
},
};
How do i create a loop function in Java using an array of cities?
You can create a loop function in Java using an array of cities using a for loop.
java Copy code
// Initialise the array
String[] cities = {"London", "New York", "Tokyo", "Paris"};
// Use a for loop to iterate through the array
for(int i = 0; i< cities.length; i++){
System.out.println(cities[i]);
}
For more information on creating loops in Java, please refer to the Oracle documentation.
alert in javascript
In JavaScript, alert() is a built-in function that displays an alert box with a specified message and an OK button.
Syntax:
javascript Copy code
alert(message);
Example:
javascript Copy code
alert("This is an alert box!");
If you have any other questions, you can easily reach out to us here
AI stands for Artificial Intelligence. AI bots are able to learn from conversations with users and expand their knowledge this way.
SheCodes Athena will help you with technical questions about your code using artificial intelligence to find the answer. Imagine a super powerful human who has memorized everything on the internet and can access that knowledge in a matter of seconds. ๐คฏ
SheCodes Athena can answer most coding-related questions, even complicated ones! It can even find bugs in your code and tell you how to fix them in just a few seconds. Impressive, right?
Just remember we're still in testing mode so the AI may return strange or incorrect replies. Feel free to message us if this happens!
SheCodes Athena can only reply to coding-related technical questions. The same type of questions you would ask in the channels on Slack.
For questions that are not coding-related, write us here ๐
You should treat Athena like a SheCodes team member, so always be polite! ๐ Ask your questions as detailed as possible, just like you would do on Slack.
Here are some examples:
- Prettier isn't working on my VS Code. How do I fix this?
- How do I make bullet points with different colors using the list element?
- My code in Codesandbox is having some issues. Can you please tell me what the issue is? [Include the link to your Codesandbox]
For now, SheCodes Athena is limited to 5 questions per day for each student.
In that case, you can either ask SheCodes Athena a follow-up question, or you can post on the designated weekly channel on Slack!
Our technical assistants are still available on Slack and are always happy to help! ๐๐ช
Remember, questions are limited to 1000 characters.
- If you're working with an HTML file: Post a snippet of your code related to the issue you're having (just copy the code and paste it into the question box).
- If you're working with Codesandbox: Good news, you can just post the link to your Codesandbox and the AI Assistant will be able to view your code.
- If you have a longer question that would require an entire HTML file or more than 1000 characters, post it in the designated weekly channels on Slack! ๐
Athena was the Greek goddess of wisdom, among other elements. She received her name from the city of Athens, which she is known for protecting.
Much like the goddess Athena, SheCodes Athena is also incredibly wise and can solve complicated coding puzzles in a matter of seconds! ๐
Not likely. AI can automate tasks and make developers' jobs more efficient but it can't fully replace the human ability to deal with complex software. And AI will still require human developers to supervise and improve it further.
So developers may see their tasks change but they won't be replaced by AI. ๐ฉโ๐ป๐ค๐ป