JavaScript Basics

Strings

Strings hold text. You can use single quotes, double quotes or backticks.

const first = "Sara";
const last = 'Khan';
const full = first + " " + last;  // joining with +

Template literals

Backticks let you put variables straight into a string with ${...} and write over several lines.

const course = "JavaScript";
const lessons = 13;
console.log(`${course} has ${lessons} lessons.`);

Output

JavaScript has 13 lessons.

Useful string methods

const text = "  Learn JavaScript  ";

text.length;              // 20
text.trim();              // "Learn JavaScript"
text.toUpperCase();       // "  LEARN JAVASCRIPT  "
text.includes("Java");    // true
text.trim().split(" ");   // ["Learn", "JavaScript"]
text.replace("Learn", "Master");
"hello".at(-1);           // "o"
"abc".slice(0, 2);        // "ab"