default フィルター（空値をデフォルト値に置き換え）

{
  "category": "default",
  "deprecated": false,
  "deprecation_reason": "",
  "description": "",
  "parameters": [
    {
      "description": "Whether to use false values instead of the default.",
      "name": "allow_false",
      "positional": false,
      "required": false,
      "types": [
        "boolean"
      ]
    }
  ],
  "return_type": [
    {
      "type": "untyped",
      "name": "",
      "description": "",
      "array_value": ""
    }
  ],
  "examples": [
    {
      "name": "",
      "description": "",
      "syntax": "",
      "path": "/products/health-potion",
      "raw_liquid": "{{ product.selected_variant.url | default: product.url }}",
      "parameter": false,
      "display_type": "text",
      "show_data_tab": true
    },
    {
      "name": "allow_false",
      "description": "By default, the  `default` filter's value will be used in place of `false` values. You can use the `allow_false` parameter to allow variables to return `false` instead of the default value.\n",
      "syntax": "variable | default: variable, allow_false: boolean",
      "path": "/products/health-potion",
      "raw_liquid": "{%- assign display_price = false -%}\n\n{{ display_price | default: true, allow_false: true }}",
      "parameter": true,
      "display_type": "text",
      "show_data_tab": true
    }
  ],
  "summary": "Sets a default value for any variable whose value is one of the following:\n\n- [`empty`](/docs/api/liquid/basics#empty)\n- [`false`](/docs/api/liquid/basics#truthy-and-falsy)\n- [`nil`](/docs/api/liquid/basics#nil)",
  "syntax": "variable | default: variable",
  "name": "default"
}