itafroma

    {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "type": "object",
        "properties": {
            "price": {
                "type": "number",
                "multipleOf": 0.01,
                "minimum": 0
            },
            "currency": {
                "type": "string",
                "enum": ["EUR", "USD", "GBP"],
                "default": "EUR"
            }
        }
    }

    # frozen_string_literal: true
    str = 'foo'
    str << 'bar'

    # main.rb:3:in `<main>': can't modify frozen String (RuntimeError)

    str = 'foo'.freeze
    str << 'bar'

    # main.rb:2:in `<main>': can't modify frozen String (RuntimeError)