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- The primary purpose of an if statement in a TypeScript function is to execute a block of code conditionally based on a boolean expression.
- The correct syntax for a simple if statement in a function is
if (condition) { ... }
. - The purpose of an else statement used with an if statement is to provide an alternative code block if the if condition is false.
- If the condition in an if statement is false, the code block following the if statement (if any) is executed.
- To check if a number is positive, negative, or zero, you can utilize an if…else if…else structure with conditions for each range.
- The role of an else if statement in a chain of conditional statements is to provide an alternative code block if all previous if conditions were false.
- The order of evaluation for an if…else if…else chain in a function is that the conditions are evaluated from top to bottom, stopping at the first true condition.
- A common mistake when using if…else if…else statements is forgetting curly braces { } for code blocks within each statement.
- The appropriate way to check if a variable is null or undefined in an if statement is
if (variable === null || variable === undefined) { ... }
. - To write a function that takes a grade as a number and returns a letter grade based on ranges, you can utilize an if…else if…else structure with conditions for each grade range.
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