String Concatenation in JavaScript

Remember that string concatenation is used to dynamically generate messages that can be different depending on context.

We most often use it with variables, let's check an example:

let adjective = "awesome";
let message = "AlgoCademy is ";

// String concatenation & assignment:
message = message + adjective;

console.log(message); // Output: AlgoCademy is awesome

We first concatenate message and favoriteAnimal and then we assign the result to message.

Concatenating with +=

Since this is such a common pattern, there is the += operator which does both the concatenation and assignment in one step.

let adjective = "awesome";
let message = "AlgoCademy is ";

// With += operator:
message += adjective;

console.log(message); // Output: AlgoCademy is awesome

Concatenating multiple strings:

We can append as many strings as we want using the += operator:

let name = "Andy";
let pet = "dog";
let message = "Hey, ";

message += name;
message += "! Nice "; 
message += pet;
message += "!" ;

console.log(message); // Output: Hey, Andy! Nice dog!

Assignment
Follow the Coding Tutorial and let's practice with string concatenation!

Hint
Look at the examples above if you get stuck.