Cleaner Apex Code with Multiline Strings and Using String.template() -

 The new Multiline Strings and String.template() functionality in Salesforce Summer ’26 is a major quality-of-life improvement for Apex developers.

• Create multiline strings using triple single quotes (''')
• Perform named variable interpolation using String.template()
• Avoid repetitive string concatenation
• Replace index-based placeholders from String.format()

Ex :

String formatted = '''

{

    "Account": "${accountName}",

    "Last Updated": "${date}"

}

'''.template(new Map<String, Object>{

    'accountName' => 'My Account',

    'date' => DateTime.now()

});

System.debug(formatted);