double quotes vs single quote

• Single quote is more readable and looks better when representing an empty string. See `''` in comparison to `""`.
• In most keyboards, you might need to press extra key (Shift) to get the double quotes character
• We don't have to escape if you write HTML in a string:

const div = '<div class="message">Hello</div>';

• Double quotes are often used in other programming languages. So people will get used to it easily when switching to JavaScript.

#Good practice

• Airbnb
• Google
• React

// ESLint rule
quotes: [ERROR, 'single', {...}],

• jQuery
• Typescript

// ESLint rule
"@typescript-eslint/quotes": ["error", "double", { ... }],

#Tip

// Instead of
const message = 'It\\'s a message';

// We can do this which is more convenient
const message = `It\'s a message`;