@nlighten/json-transform-core/dist/functions/examples/reduce.json

Core types and utilities for handling JSON transformers

[
    {
        "name": "object - reduce",
        "given": {
            "input": {
                "items": [
                    {
                        "id": "aaa",
                        "amount": 10
                    },
                    {
                        "id": "bbb",
                        "amount": 20
                    }
                ]
            },
            "definition": {
                "$$reduce": "$.items",
                "identity": 0,
                "to": {
                    "$$math": [
                        "##accumulator",
                        "+",
                        "##current.amount"
                    ]
                }
            }
        },
        "expect": {
            "equal": 30
        }
    },
    {
        "name": "object - value lookup",
        "given": {
            "input": {
                "items": [
                    {
                        "id": "aaa",
                        "amount": 10
                    },
                    {
                        "id": "bbb",
                        "amount": 20
                    }
                ]
            },
            "definition": {
                "$$reduce": "aaa",
                "identity": "bbb",
                "to": "##current"
            }
        },
        "expect": {
            "isNull": true
        }
    },
    {
        "name": "inline",
        "given": {
            "input": {
                "items": [
                    {
                        "id": "aaa",
                        "amount": 10
                    },
                    {
                        "id": "bbb",
                        "amount": 20
                    }
                ]
            },
            "definition": "$$reduce('$$math(##accumulator,+,##current.amount)',0):$.items"
        },
        "expect": {
            "equal": 30
        }
    }
]