If Statement
In JavaScript, if statement is used to execute a block of code based on a condition.
Syntax
if (condition) {
//code
}
where
if
is keyword.condition
is a boolean expression.code
is any valid JavaScript code.
If condition is true, then if-block code is run..

Examples
1. In the following program, we check if number in a
is even using if-statement.
a = 10;
if (a%2 == 0) {
console.log("a is even.");
}
2. In the following program, we check if supplies
are good (greater than 5) using an if-statement.
supplies = 10;
if (supplies > 5) {
console.log("Supplies are good.");
}