In the last clone (recursive code) the function have to return a copy of item, {...item}, in order to create deep cloning, not the item reference. The whole piece of code is:
const clone = (items) => items.map(item => Array.isArray(item) ? clone(item) : {...item});
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In the last clone (recursive code) the function have to return a copy of item, {...item}, in order to create deep cloning, not the item reference.
The whole piece of code is:
const clone = (items) => items.map(item => Array.isArray(item) ? clone(item) : {...item});