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Control Flow In JS

By on Aug 21, 2023

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Control flow statements are used to control the flow of execution in a program. They are used to make decisions, execute loops, and handle errors. There are three types of control flow statement in JavaScript:

  • Conditional Statements
  • Loops
  • try/catch statements.

Conditional Statements:

Conditional statement in JavaScript are used to make decisions based on certain conditions. These allow you to execute different blocks of code depending on whether a given condition evaluates to true or false. The main types of conditional statements in JavaScript are:

1. if statements:

The if statement is used to execute a block of code if a specified condition is true.

let age = 18;

if(age >= 18) {
   console.log('You are an adult.');
}

2. if-else statement:

The if-else statement is used to execute one block of code if a condition is true, and another block of code if the condition is false.

let temperature = 25;

if(temperature > 30){
   console.log("It's hot outside.")
} else {
   console.log({"It's not too hot.");
}

3. if-else if-else statement:

This allows you to check multiple condition in a sequence and execute the block of code corresponding to the first true condition.

let time = 14;

if(time < 12){
   console.log('Good morning');
} else if(time < 18) {
   console.log('Good afternoon!');
} else {
   console.log('Good evening!');
}

Loops

Loops are used to repeatedly execute a block of code as long as specified condition is true.

There are mainly two types of loops in JavaScript.

1. For loop:

The for loop allows you to execute a block of code repeatedly for a specific number of iterationd.

for(let i = 1; i <= 5; i++){
    console.log('Iteration '+i)
};

2. while loop:

The ‘while‘ loop repeatedly executes a block of code as long as a specific condition is true/

let count = 0;

while (count < 5) {
   console.log("Count: "+ count);
   count++;
}
https://sentensecase.com/blog/loops-and-iteration/
Read more detailed about loop here

try/catch Statements:

The try/catch statement is used for error handling in JavaScript. It allows you ti catch and handle errors that might occur during the execution of a block of code.

try {
    // Code that might throw an error
    let result = 10/0;
    console.log(result);
} catch (error) {
    console.log('An error occurred: '+error);
}

Break and Continue

 They allow you to alter the execution of a loop on certain conditions.

Read more