In ES2015 (ES6), we can use template literals instead of string concatenation.

const str = "Hello, " + name + "!";

const str = `Hello, ${name}!`;

Rule Details

This rule is aimed to flag usage of + operators with strings.

Examples

Examples of incorrect code for this rule:

::: incorrect

/*eslint prefer-template: "error"*/

const str = "Hello, " + name + "!";
const str1 = "Time: " + (12 * 60 * 60 * 1000);

:::

Examples of correct code for this rule:

::: correct

/*eslint prefer-template: "error"*/

const str = "Hello World!";
const str1 = `Hello, ${name}!`;
const str2 = `Time: ${12 * 60 * 60 * 1000}`;

// This is reported by `no-useless-concat`.
const str4 = "Hello, " + "World!";

:::

When Not To Use It

This rule should not be used in ES3/5 environments.

In ES2015 (ES6) or later, if you don't want to be notified about string concatenation, you can safely disable this rule.