To use the if-else statement in Java, you can follow this syntax:

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if (condition) {
    // code to be executed if the condition is true
} else {
    // code to be executed if the condition is false
}

Here's an example to demonstrate its usage:

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int num = 10;

if (num > 0) {
    System.out.println("The number is positive.");
} else {
    System.out.println("The number is not positive.");
}

In this example, if the num variable is greater than 0, it will print "The number is positive." Otherwise, it will print "The number is not positive."

To write an if-else statement, you can follow this syntax:

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if (condition) {
  // Code to be executed if the condition is true
} else {
  // Code to be executed if the condition is false
}

Here's an example:

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let temperature = 25;

if (temperature > 30) {
  console.log("It's hot outside!");
} else {
  console.log("It's not too hot.");
}

In this example, if the temperature is greater than 30, the message "It's hot outside!" will be printed. Otherwise, the message "It's not too hot." will be printed.

To prevent multiple rendering of an API, you can use an if/else statement to check if the data has already been fetched or not. If the data has already been fetched, then you can skip the API call and use the data that has already been retrieved. If the data has not yet been fetched, then you can proceed with making the API call.

Here's some example code in JavaScript:

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let data = null;

if (data) {
  // use the data that has already been fetched
} else {
  // make the API call and retrieve the data
  fetch('https://example.com/api')
    .then(response => response.json())
    .then(json => {
      data = json;
      // use the retrieved data
    });
}

In this example, we first define a data variable and set it to null. We then use the if/else statement to check if data is truthy (i.e., not null). Since data is initially null, the else block will be executed, which makes the API call using the fetch function. Once the data is retrieved, the then block is executed, which sets the data variable to the retrieved data. The data can then be used as needed.

By using this if/else statement to prevent multiple API calls, you can optimize the performance of your application and reduce unnecessary network requests.

Here's an example code using if and else statement in JavaScript to alert "Good afternoon" if the current time is between 12pm and 6pm (18:00):

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const currentTime = new Date(); // get the current time
const currentHour = currentTime.getHours(); // get the current hour (0-23)

if (currentHour >= 12 && currentHour < 18) {
  alert("Good afternoon"); // display "Good afternoon" if currentHour is between 12 and 18 (6pm)
} else {
  // do something else if currentHour is outside of the range
}

This code gets the current time and extracts the current hour from it using the getHours() method. Then, it checks if the current hour (currentHour) is greater than or equal to 12 AND less than 18 using the logical AND operator (&&). If this condition is true, it displays an alert message saying "Good afternoon" using the alert() method. If the condition is false, it can do something else using the else statement.

To use if else statements in JavaScript, follow these steps:

1. Write the if keyword, followed by a set of parentheses ().
2. Inside the parentheses, write your condition. This is the test that JavaScript will run. It should be a comparison that results in either true or false. For instance, x > y, i % 2 == 0, etc.
3. After the closing parentheses, write an opening curly brace { to denote the beginning of a code block.
4. Inside the code block, write the code that you want to execute if the condition is true.
5. After the code block, write else followed by another opening curly brace {.
6. Inside this new block of code, write the code you want to execute if the condition is false.
7. Close both code blocks with a closing curly brace }.

Example:

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let x = 10;
let y = 5;

if (x > y) {
  console.log("x is greater than y");
} else {
  console.log("y is greater than or equal to x");
}

This will output x is greater than y, because the condition inside the parentheses is true.

Here's an example code for adding borders to images within an if else statement in JavaScript:

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// Get the image element
var image = document.getElementById("myImage");

// Check if the image is landscape or portrait
if (image.width > image.height) {
  // If landscape, add a red border
  image.style.border = "5px solid red";
} else {
  // If portrait, add a blue border
  image.style.border = "5px solid blue";
}

You can customize the border style and color according to your preferences. Make sure to replace "myImage" with the ID of your image element in the HTML code.

In CSS, you can also set the border for all images in your HTML using the following code:

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img {
  border: 5px solid black;
}

This will add a 5px black border to all images within your HTML file. You can also customize the CSS properties such as the border-style, border-width, and border-color.

To access properties inside an array of objects in JavaScript, you can use the array method forEach() or map(). Then, you can use an if...else statement to perform different actions based on the value of the property.

Example in JavaScript:

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// array of objects
const students = [
  { name: 'John', grade: 'A' },
  { name: 'Jane', grade: 'B' },
  { name: 'Bob', grade: 'C' }
];

students.forEach(student => {
  if (student.grade === 'A') {
    console.log(`${student.name} passed with distinction!`);
  } else if (student.grade === 'B') {
    console.log(`${student.name} passed.`);
  } else {
    console.log(`${student.name} failed.`);
  }
});

In the example above, we have an array of objects called students. We used the forEach() method to loop through each object in the array. Then, we used an if...else statement to check the value of the grade property of each student object. Depending on the value of grade, we printed a different message to the console.

I hope this helps! Let me know if you have any further questions.

An if-else statement is a conditional statement in programming that executes different code depending on whether a specified condition is true or false. It is commonly used to control the flow of a program. Here is an example in JavaScript:

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let num = 5;

if (num > 10) {
  console.log("The number is greater than 10.");
} else {
  console.log("The number is less than or equal to 10.");
}

This code will output "The number is less than or equal to 10." because the condition in the if statement is not true, so the code in the else statement will be executed instead.

To alert a property of an object inside another object using if else statements in JavaScript, you can follow these steps:

1. First, define the objects and their properties that you want to work with. For example:

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const student = {
  name: "John",
  age: 25,
  grade: {
    math: 85,
    science: 92,
    english: 80
  }
};

1. Next, use an if else statement to check if the property you want to alert exists in the nested object. For example:

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if (student.grade.math) {
  alert(`John's math grade is ${student.grade.math}`);
} else {
  alert("John has no math grade");
}

This will check if student.grade.math is truthy or falsy. If it exists and has a value, an alert will pop up showing John's math grade. Otherwise, it will show a message indicating that he has no math grade.

Here's the full code example:

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const student = {
  name: "John",
  age: 25,
  grade: {
    math: 85,
    science: 92,
    english: 80
  }
};

if (student.grade.math) {
  alert(`John's math grade is ${student.grade.math}`);
} else {
  alert("John has no math grade");
}

I hope this helps! Let me know if you have any further questions.

In JavaScript, the if...else statement can check if a number is in a certain range. For example, if you wanted to check if a number was between 10 and 20, you would do:

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let number = 12;

if (number > 10 && number < 20) {
  console.log('The number is within range!');
} else {
  console.log('The number is not within range');
}

The output would then be The number is within range! because 12 is between 10 and 20.

For more information about if...else statements, see MDN Web Docs.

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if (condition) {
  // code
} else {
  // code
}

You can use the following code to create a time range using if...else statements in JavaScript:

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var time = new Date().getHours();

if (time < 12) {
  console.log("Good Morning");
} else if (time >= 12 && time < 17) {
  console.log("Good Afternoon");
} else if (time >= 17 && time < 20) {
  console.log("Good Evening");
} else {
  console.log("Good Night");
}

You can use the > and < symbols in Javascript to check if a number is greater than 12 but less than 18 in an if / else statement.

For example:

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if (num > 12 && num < 18) {
  console.log("Number is greater than 12 and less than 18");
} else {
  console.log("Number is not between 12 and 18");
}

You can create a prompt question with different spelling answers in most modern coding languages. A common example using JavaScript would be using the prompt() function to ask the user a question, followed by the if...else command to determine whether their response is spelled correctly. For example:

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let answer = prompt('What do you call a group of lions?');

if (answer === 'pride') {
  alert('You got it right!');
} else {
  alert('The correct spelling is "pride"');
}

That way, if the user spells the answer incorrectly, the if...else statement will alert them.

More information on prompt() and if...else statements can be found here:

• prompt()
• if...else

An if else statement enables you to control the flow of your program based on a given condition. If a given condition is true, then the program will execute a certain set of statements, otherwise, it will execute the block of code inside the else statement.

In most programming languages you can write an if else statement using the following syntax:

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if (condition) {
  // Statements to be executed if the condition is true
} else {
  // Statements to be executed if the condition is false
}

For example, in the C programming language one could write the following code:

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int x = 10;
if (x == 10) {
  printf("x is equal to 10");
} else {
  printf("x is not equal to 10");
}

The output from this code would be x is equal to 10.