PROGRAMMING_CONSTRUCTS.md

Fundamentals of JavaScript

Conditional Statements

Conditional statement is a set of rules performed if a certain condition is met. The two types of conditional statements are:

• if
• else if

To declare an if statement in JavaScript you need to use the ‘if’ keyword. The syntax is as follows:

if(condition) {
statement;
}

Else statement is used to execute a block of code if the same condition is false. The syntax is as follows:

if(condition) {
statement a;
}
else (condition) {
statement b;
}

Loops Constructs

Loops are used to repeat a specific block until some end condition is met. There are three categories of loops in JavaScript :

1. while loop
2. do while loop
3. for loop

while loop

While the condition is true, the code within the loop is executed.

The syntax is:

 while(condition) {
loop code;
}

do-while loop

This loop will first execute the code, then check the condition and while the condition holds true, execute repeatedly.

The syntax is as follows:

do {
loop code;
} while(condition);

for loop

The for loop repeatedly executes the loop code while a given condition is TRUE. It tests the condition before executing the loop body.

The syntax is:

for(initialisationExpression; testExpression; incrementalExpression) {
loop code;
}

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