Conditional statements in JavaScript are used to perform different actions based on different conditions.
Very often when you write code, you want to perform different actions for different decisions. You can use conditional statements in your code to do this.
In JavaScript we have the following conditional statements:
You should use the if statement if you want to execute some code only if a specified condition is true.
if (condition1)
{
code to be executed if condition1 is true
}
else if (condition2)
{
code to be executed if condition2 is true
}
else
{
code to be executed if condition1 and condition2 are not true
}
Note: When comparing variables you must always use two equals signs next to each other (==)!
Notice that there is no ..else.. in this syntax. You just tell the code to execute some code only if the specified condition is true.
If you want to execute some code if a condition is true and another code if the condition is not true, use the if....else statement.
if (condition)
{
code to be executed if condition is true
}
else
{
code to be executed if condition is not true
}
