Introduction

What Exactly Are Strings? Strings are essentially sequences of characters used to represent text in programming. They can include letters, numbers, symbols, and spaces.

Example Code:

// Add two strings together

let fruit1 = "Apple";
let fruit2 = "Banana";
let combinedFruits = fruit1 + " and " + fruit2;
console.log("Fruits to eat: " + combinedFruits);

In the example above, there are two variables: fruit1 and fruit2. Notice how apple and banana are in quotation marks? That indicates that they are strings. In JavaScript, strings are enclosed in single quotes (‘ ‘), double quotes (“ “), or backticks ( ). The “and” in between the two fruits is also a string. When we add the strings together using the + operator, we get a new string that combines them.

Now you try:

Code Runner Challenge

Identify and correct the error in the code.

View IPYNB Source 
%%js

// CODE_RUNNER: Identify and correct the error in the code.

 let sport1 = "Soccer";
 let sport2 = "Basketball";

 console.log(The sports I play are:  + sport1 + " and " + sport2);
Lines: 1 Characters: 0
Output
Click "Run" in code control panel to see output ...

String Length and Indexing

String Lenth: You can find out how many characters are in a string using the .length property. Spaces also count as a character.

Example:

let message = "Hello World";
console.log(message.length); // Will output 11 because there are 11 characters

String Indexing: Each character in a string has an index, starting from 0 for the first character. You can access individual characters using bracket notation.

Example:

let greeting = "Hello World";
console.log(greeting[0]); // Will output "H"
console.log(greeting[6]); // Will output "W"

Code Runner Challenge

Modify this code so that the password requires at least 8 characters and the first character is equal to 3. Remember, the first character is 0, not 1.

View IPYNB Source 
%%js

// CODE_RUNNER: Modify this code so that the password requires at least 8 characters and the first character is equal to 3. Remember, the first character is 0, not 1.

let password = "abc";
if (password.length < 8 || password[0] !== "3") { // FYI, "||" means OR, and "!==" means NOT EQUAL TO
    console.log("Password must be at least 8 characters and start with '3'");
} else {
    console.log("Password is valid!");
}
Lines: 1 Characters: 0
Output
Click "Run" in code control panel to see output ...

String Concatenation

String Concatenation: is simply the process of combining two or more strings together. In JavaScript, you can concatenate strings using the + operator.

Example:

let firstName = "John";
let lastName = "Smith";
let fullName = firstName + " " + lastName; // Those quotation marks just add a space between the words
console.log(fullName); // Will output "John Smith"

Code Runner Challenge

Add your own information to the constants below and use concatenation to print a sentence about yourself.

View IPYNB Source 
%%js

// CODE_RUNNER: Add your own information to the constants below and use concatenation to print a sentence about yourself.

const name = "x";
const age = y;
const city = "z";

// Your code here
Lines: 1 Characters: 0
Output
Click "Run" in code control panel to see output ...