Javascript String Formatting

Template Literals

Template literals (also known as template strings) are string literals allowing embedded expressions. You can use multi-line strings and string interpolation features with them. They were introduced in ECMAScript 6.

Template literals can contain placeholders, indicated by the dollar sign and curly braces (${expression}). The expressions in the placeholders and the text between them get passed to a function.

let name = "John";
let age = 30;
let greeting = `Hello, my name is ${name} and I am ${age} years old.`;

console.log(greeting); // Outputs: "Hello, my name is John and I am 30 years old."

Here, name and age are variables. The template literal is defined using backticks, and the variables are embedded in the string using ${} syntax. The resulting string is stored in the greeting variable and then logged to the console.

String Concatenation

String concatenation is the operation of joining two or more strings together. This can be achieved using the + operator or the concat method.

Using the + Operator

Here’s an example of string concatenation using the + operator:

let str1 = "Hello, ";
let str2 = "World!";
let result = str1 + str2;

console.log(result); // Outputs: "Hello, World!"

str1 and str2 are strings. The + operator is used to concatenate str1 and str2 together. The resulting string is stored in the result variable and then logged to the console.

Using the concat Method

Here’s an example of string concatenation using the concat method:

let str1 = "Hello, ";
let str2 = "World!";
let result = str1.concat(str2);

console.log(result); // Outputs: "Hello, World!"

str1 and str2 are strings. The concat method is called on str1 with str2 as the argument, concatenating str1 and str2 together. The resulting string is stored in the result variable and then logged to the console.

The recommended way

The recommended way to format strings in JavaScript is by using Template Literals (Template Strings) introduced in ECMAScript 6 (ES6). Template literals allow you to embed expressions, create multi-line strings, and use string interpolation features, making them a powerful tool for string formatting.