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The condition is a Boolean expression that evaluates to either true or false. If the condition evaluates to true, the code inside the if block is executed. If the condition evaluates to false, the code inside the else block is executed.
For example, the following code uses an if…else statement to check if the value of the variable num is greater than 10:
If the value of num is greater than 10, the code inside the if block will be executed. If the value of num is not greater than 10, the code inside the else block will be executed.
The if...else statement can be used to execute different code depending on the value of a variable or expression. It is a very powerful tool that can be used to control the flow of your code.
Here are some rules to follow when using the if…else statement:
  • The condition must be a Boolean expression.
  • The if block and the else block must be terminated by a semicolon.
  • The if block and the else block can contain any valid JavaScript code.
The expression is a variable or expression that is evaluated. The value of the expression is then compared to the values in the case statements. If the value of the expression is equal to the value of a case statement, the code inside the case statement is executed. The break statement is used to exit the switch statement. If the value of the expression is not equal to any of the values in the case statements, the code inside the default block is executed.
For example, the following code uses a switch statement to check the value of the variable color:
If the value of color is equal to “red”, the code inside the case statement with the value “red” is executed. If the value of color is equal to “green”, the code inside the case statement with the value “green” is executed. If the value of color is equal to “blue”, the code inside the case statement with the value “blue” is executed. If the value of color is not equal to any of the values in the case statements, the code inside the default block is executed.
The switch statement can be used to execute different code depending on the value of a variable or expression. It is a very powerful tool that can be used to control the flow of your code.
Here are some rules to follow when using the switch statement:
  • The expression must be a variable or expression that can be evaluated to a value.
  • The case statements must be terminated by a semicolon.
  • The break statement is optional, but it is a good practice to use it to exit the switch statement.
  • The default block is optional, but it is a good practice to include it in case the value of the expression does not match any of the case statements.
The condition is a Boolean expression that evaluates to either true or false. If the condition evaluates to true, the value of the value_if_true expression is returned. If the condition evaluates to false, the value of the value_if_false expression is returned.
For example, the following code uses the ternary operator to check if the value of the variable num is greater than 10:
If the value of num is greater than 10, the value of the value_if_true expression, which is “greater than 10”, is returned. If the value of num is not greater than 10, the value of the value_if_false expression, which is “less than or equal to 10”, is returned.
The ternary operator can be used to replace an if…else statement in many cases. It is a shorter and more concise way of writing code.
Here are some other examples of using the ternary operator:
The ternary operator can be a very useful tool for writing concise and efficient code. It is a good practice to use it whenever possible.
The && operator evaluates the first logical expression, which is num > 10. If the first logical expression evaluates to true, the && operator then evaluates the second logical expression, which is num < 20. If the second logical expression also evaluates to true, the && operator returns true. If either of the logical expressions evaluates to false, the && operator returns false.
The && operator can be used to combine any number of logical expressions. The && operator is a short-circuiting operator, which means that it will only evaluate the second logical expression if the first logical expression evaluates to true. This can be useful for improving the performance of your code.
Here are some other examples of using the && operator:
The && operator can be a very useful tool for writing concise and efficient code. It is a good practice to use it whenever possible.
Here is an example of an if...else statement:
This code first checks if the value of the variable num is greater than 10. If the value of num is greater than 10, the code inside the if block is executed. If the value of num is not greater than 10, the code inside the else block is executed.
Here is an example of a switch statement:
This code first checks the value of the variable color. If the value of color is equal to “red”, the code inside the case "red" block is executed. If the value of color is equal to “green”, the code inside the case "green" block is executed. If the value of color is equal to “blue”, the code inside the case "blue" block is executed. If the value of color is not equal to any of the values in the case statements, the code inside the default block is executed.
The condition is a Boolean expression that evaluates to either true or false. If the condition evaluates to true, the value of the value_if_true expression is returned. If the condition evaluates to false, the value of the value_if_false expression is returned.
Here is an example of a nested conditional statement using the ternary operator:
This code first checks if the value of the variable num is greater than 5. If the value of num is greater than 5, the value of the value_if_true expression, which is “greater than 5”, is returned. If the value of num is not greater than 5, the code then checks if the value of num is less than 5. If the value of num is less than 5, the value of the value_if_false expression, which is “less than 5”, is returned. If the value of num is neither greater than 5 nor less than 5, the value of the value_if_false expression, which is “equal to 5”, is returned.
The ternary operator can be used to nest conditional statements in any way you want. It is a very powerful tool for writing concise and efficient code.
Here are some other examples of using the ternary operator in a nested conditional statement:
The ternary operator can be a very useful tool for writing concise and efficient code. It is a good practice to use it whenever possible.

      

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