JS conditional statements
JS conditional statements
In JavaScript, if, else, and else if statements are used to control the flow of a program based on certain conditions. These statements allow you to execute different blocks of code based on whether a condition is true or false.
Here’s an example of an if statement:
const x = 5;
if (x > 0) {
console.log("x is positive");
}
In this example, the if statement checks whether the value of x is greater than 0. If it is, the code inside the curly braces is executed, which logs the message “x is positive” to the console.
You can also use an else statement to specify what should happen if the condition in the if statement is false:
const x = -5;
if (x > 0) {
console.log("x is positive");
} else {
console.log("x is not positive");
}
In this example, the if statement checks whether the value of x is greater than 0. If it is, the code inside the first set of curly braces is executed. If it’s not, the code inside the second set of curly braces (the else block) is executed instead, which logs the message “x is not positive” to the console.
You can also use an else if statement to check additional conditions:
const x = 0;
if (x > 0) {
console.log("x is positive");
} else if (x < 0) {
console.log("x is negative");
} else {
console.log("x is zero");
}
In this example, the if statement checks whether the value of x is greater than 0. If it is, the code inside the first set of curly braces is executed. If not, the else if statement checks whether x is less than 0. If it is, the code inside the second set of curly braces is executed. If neither condition is true, the code inside the else block is executed instead, which logs the message “x is zero” to the console.
You can chain together as many else if statements as you need to check additional conditions.