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What is a falsy value in js?
In JavaScript, a falsy value is a value that is considered false when encountered in a boolean context. This means that if a variable holds a falsy value when used in an if statement or a conditional expression, it will be treated as false and the corresponding code block will not be executed.
The following values are considered falsy in JavaScript:
You can use the Boolean function in JavaScript to check if a value is truthy or falsy. It returns false for falsy values and true for truthy values.
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console.log(Boolean(0)); // false
console.log(Boolean("")); // false
console.log(Boolean(null)); // false
console.log(Boolean(undefined)); // false
console.log(Boolean(NaN)); // false
console.log(Boolean(1)); // true
console.log(Boolean("hello")); // true
console.log(Boolean({})); // true
console.log(Boolean([])); // true
What is a ternary expression and what is an example?
A ternary expression is a conditional expression that allows you to assign a value based on a condition. It is often used as a shorthand for an if-else statement.
Here is an example in JavaScript:
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let age = 18;
let message = (age >= 18) ? "You are an adult" : "You are not an adult";
console.log(message); // Output: You are an adult
In this example, we have a condition age >= 18, and if it is true, the value "You are an adult" is assigned to the message variable, otherwise, the value "You are not an adult" is assigned. The ternary operator (?) separates the condition and the two possible outcomes.
what does the ? mean in the let statement
In JavaScript, the ? symbol usually follows an expression, and it's part of a conditional (ternary) operator. The let statement is used for declaring and initializing a variable. The ? symbol is usually used in a ternary operator to provide an alternative expression if the condition is true, and a different one if the condition is false.
A basic example of a ternary operator with a let statement in JavaScript could look like this:
javascript Copy code
let price = (product === 'apple') ? 0.5 : 1.0;
In the code above, the condition being evaluated is (product === 'apple'). If the evaluation is true, the expression returns the value 0.5, otherwise it returns the value 1.0. Finally, the result of the expression is assigned to the price variable using the let statement.
Therefore, the ? symbol by itself does not have a specific meaning inside a let statement. It is the context in which it appears that determines its purpose.
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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!
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For questions that are not coding-related, write us here 😃
You should treat Athena like a SheCodes team member, so always be polite! 😊 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!
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Remember, questions are limited to 1000 characters.
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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.
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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. 👩💻🤝💻