Conditional statements execute specific actions from a code depending on whether the result of the code is true or false.
This means if a condition is true, a specific code runs and if false, another code runs.
If statement
The 'if' statement runs a specified code segment if the given result is ''true.''
This implies that the code block will be ignored in the case of a false result, and the code will move on to the next section.
let location = "outside"; if (location === "outside") { console.log("Wear your nose mask! 😷"); } //Output: Wear your nose mask! 😷 Else statement
The 'else' statement is written after the if statement and executes the code if the result of the given condition is 'false'.
let location = "inside"; if (location === "outside") { console.log("Wear your nose mask! 😷"); } else { console.log("I don't need a nose mask 😃"); } //Output: I don't need a nose mask 😃 Else if statement
The 'else if' specifies another condition if the first condition is not true. They are used to add more conditions to an if/else statement.
let location = "inside"; if (location === "outside") { console.log("Wear your nose mask! 😷"); } else if (location === "inside") { console.log("I don't need a nose mask 😃"); } else { console.log("Always protect yourself"); } //Output: I don't need a nose mask 😃 Switch-case statement
This is a really cool way to execute different sets of statements based on the value of a variable. It is a neater version of multiple If-Else-If blocks.
A break is used between the cases & the default case gets evaluated when none of the cases are true
let location = "my room"; switch (location) { case "outside": console.log("Wear your nose mask!"); break; case "my room": console.log("Yaay, I can relax 💆"); break; default: console.log("Always protect yourself!"); } //Output: Yaay, I can relax 💆 Ternary Operator
The ternary operator is a shorthand syntax for an if/else statement.
The first expression after the ? executes when the condition evaluates to true, and the second expression after : executes when the condition evaluates to false.
const location = "outside"; location === "outside" ? console.log("Wear your nose mask! 😷") : console.log("Always protect yourself!"); Output: Wear your nose mask! 😷 
Top comments (0)