Firstly, Control Flow is the technical term for specifying the sequence in which a code executes. In this article, we will discuss the three structures that impact the control flow.
What is Control Flow in JavaScript?
Basically, code executes in a top-down manner, unless the code control changes its course when it meets with other structures such as those given below:
- Loops
- Conditionals
- Functions
Hence, here we will try to discuss what each of these control flow structures is. IF you want then buy a good, reliable, secure web hosting service from here: click here
Loops
In programming, loops are the conditional statement that repeats the given work until the given condition is combined. Loop statements are also known as repeated statements.
There are three types of loops given below:
- For
- While
- Do while
Firstly, the for loop is one of the most commonly used loops in most programming languages, not just JavaScript but also simple to use.
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Syntax of For loop:
for (initialExpression; condition; updateExpression) {
// for loop body
}
Secondly, in the terms of execution, there is not much of a difference between a while loop and for loop. While loop is like to for loop, in the fashion that it repeats the process until the conditions are met.
Syntax of while loop:
while (condition) {
// body of loop
}
Thirdly, the concept of do-while loop is similar to while loop like the traditional way of looping, the do-while loop executes the statement first and then checks the condition.
Syntax of Do-while loop:
do
{
// body of loop
} while (condition)
Conditionals
Conditional statements are decision-making statements. In programming, programmers have to deal with multiple hypothetical scenarios.
However, if you are going to write codes that execute the right output, you will end up with the programmer writing more codes or, worse, none at all
So, most of the common conditional statements used in JavaScript are:
- If
- Else if
- if…else
- Switch
The if statement is the fundamental conditional statement for programming. It also comes with one condition and a block of statements within it.
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Syntax of if statement:
if (expression) {
Statement(s) // if the expression is true
}
The if…else statement also is similar to the condition if, with a twist. Instead of the control moving on to another line after the condition is proved, then the given else statement is executed.
Syntax of if…else statement:
if (expression) {
Statement(s) // if the expression is true
} else {
Statement(s) // if expression is false
}
The else if statement is very similar to the if..else condition, but it is more practical. So, the mechanism of else, it is given through the syntax like the below:
Syntax of else if Statement:
if (expression 1) {
Statement(s) // if expression 1 is true
} else if (expression 2) {
Statement(s) // if expression 2 is true
} else if (expression 3) {
Statement(s) // if expression 3 is true
} else {
Statement(s) // if no expression is true
}
The switch statement looks like an if statement. However, in the if and else if, which check the condition on each line first, then the switch tests the condition once and then performs the relevant evolution. So, a default statement is released if the condition is not met.
Syntax of switch statement:
switch (expression) {
case condition 1: statement(s)
break;
case condition 2: statement(s)
break;
case condition n: statement(s)
break;
default: statement(s) // executed when none of the conditions are met
}
Functions
When you write a specific block or area of code for a certain purpose, that code will be needed in various places of the code, which is a typical programming issue.
Therefore, writing the same code repeatedly is not a just option, which is why functions exist.
So, the functions eliminate the need for repeating the same code. Hence, all you will need to do is write a function and then use it whenever you want at any part of the program.
Syntax of Functions:
<script type = "text/JavaScript">
<!--
function functionname() {
statements
}
//-->
</script>
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