If-Else Statement
In JavaScript, if-else statement is used to execute one of the two blocks based on a condition.
Syntax
if (condition) {
//code
} else {
//code
}
where
if
is keyword.condition
is a boolean expression.else
is keyword.code
is any valid JavaScript code.
If condition is true, then if-block code is run. If condition is false, then else-block code is run.
Examples
1. In the following program, we use an if-else statement to check if a
is even or not.
a = 10;
if (a%2 == 0) {
console.log("a is even.");
} else {
console.log("a is not even.");
}
2. In the following program, we use an if-else statement to check if supplies
are good, or more supplies are needed.
supplies = 10;
if (supplies > 5) {
console.log("Supplies are good.");
} else {
console.log("Need more supplies.");
}