The flow control structures in Javascript are fundamental for the development of web sites. They allow the programmer to control the execution of the code, according to the established conditions. There are three flow control structures in Javascript: if/else, switch, and loops.
If/Else
The if/else structure is used to make decisions based on a condition. It allows code to perform one action if the condition is true and another action if the condition is false. The syntax is as follows:
if (condition) {
// code to be executed if condition is true
} else {
// code to be executed if condition is false
}
Switch
The switch is used when there are several conditions to be tested. It allows code to perform different actions based on the value of a variable. The syntax is as follows:
switch(variable) {
case value1:
// code to be executed if the variable equals value1
break;
case value2:
// code to be executed if the variable equals value2
break;
default:
// code to be executed if the variable is not equal to any of the previous values
break;
}
Loops
Loops are used to execute the same block of code multiple times. There are two types of loops in Javascript: while and for.
While
The while is used when you don't know how many times the block of code will be executed. It executes the block of code as long as the condition is true. The syntax is as follows:
Continue in our app.
You can listen to the audiobook with the screen off, receive a free certificate for this course, and also have access to 5,000 other free online courses.
Or continue reading below...
Download the app
while (condition) {
// code to be executed while the condition is true
}
For
The for is used when you know how many times the block of code will be executed. It executes the block of code a specified number of times. The syntax is as follows:
for (initialization; condition; increment) {
// code to be executed while the condition is true
}
In summary, flow control structures in Javascript are essential for web site development. They allow the programmer to control the execution of the code, according to the established conditions. It is important to know each one of them well in order to use them efficiently.
