Рекурсия есть:
const replaceKeys = (value, replacer) =>
value instanceof Object
? value instanceof Array
? value.map(n => replaceKeys(n, replacer))
: Object.fromEntries(Object
.entries(value)
.map(n => [ replacer(n[0]), replaceKeys(n[1], replacer) ])
)
: value;
const newObj = replaceKeys(obj, k => `${k}_upd`);
Рекурсии нет:
function replaceKeys(value, replacer) {
const stack = [];
const clones = new Map;
const getClone = val => val instanceof Object
? (clones.has(val) || stack.push([ val, clones.set(val, val.constructor()).get(val) ]),
clones.get(val))
: val;
for (getClone(value); stack.length;) {
const [ source, target ] = stack.pop();
const isArray = Array.isArray(source);
for (const k in source) if (Object.hasOwn(source, k)) {
target[isArray ? k : replacer(k)] = getClone(source[k]);
}
}
return getClone(value);
}
