Higher-order deep object transformer used by {@link (mapDeep:1)}. Accepts a nested spec array reflecting same key structure as the object to be mapped, but with functions or sub-specs as their values. Returns a new function, which when called, recursively applies nested transformers in post-order traversal (child transformers are run first) and returns the result of the root transformer.
remarks
The transform specs are given as arrays in this format:
Higher-order deep object transformer used by {@link (mapDeep:1)}. Accepts a nested
specarray reflecting same key structure as the object to be mapped, but with functions or sub-specs as their values. Returns a new function, which when called, recursively applies nested transformers in post-order traversal (child transformers are run first) and returns the result of the root transformer.The transform specs are given as arrays in this format:
[tx-function, { key1: [tx-function, {...}], key2: tx-fn }]If a key in the spec has no further sub maps, its transform function can be given directly without having to wrap it into the usual array structure.
// source object to be transformed src = { meta: { author: { name: "Alice", email: "a@b.com" }, date: 1041510896000 }, type: "post", title: "Hello world", body: "Ratione necessitatibus doloremque itaque." }; // deep transformation spec spec = [ // root transform (called last) ({type, meta, title, body}) => ["div", {class: type}, title, meta, body], // object of transform sub-specs { meta: [ ({author, date}) => ["div.meta", author, `(${date})`], { author: ({email, name}) => ["a", {href: `mailto:${email}`}, name], date: (d) => new Date(d).toLocaleString() } ], title: (title) => ["h1", title] } ]; // build transformer & apply to src deepTransform(spec)(src); // [ "div", // { class: "article" }, // [ "h1", "Hello world" ], // [ "div.meta", // [ "a", { href: "mailto:a@.b.com" }, "Alice" ], // "(1/2/2003, 12:34:56 PM)" ], // "Ratione necessitatibus doloremque itaque." ]