2675. Array of Objects to Matrix

https://leetcode.com/problems/array-of-objects-to-matrix

Javascript

const extract = (item, key='', result=[]) => {
    if (   typeof item === 'number' 
        || typeof item === 'string' 
        || typeof item === 'boolean' 
        || item === null) {
        return {[key]: item}
    }

    for (const [k, v] of Object.entries(item)) {
        const newKey = key === '' ? k : `${key}.${k}`
        result.push(extract(v, newKey))
    }
    return result.flat()
}

var jsonToMatrix = function(arr) {
    const mapper = arr.map(item => extract(item))
    const keys = Array.from(new Set(mapper.flat().map(item => Object.keys(item)[0])))
    keys.sort()

    const result = [keys]
    for (const items of mapper) {
        const current = []
        for (const key of keys) {
            const value = items.find((item) => item.hasOwnProperty(key))?.[key]
            current.push(value === undefined ? '' : value)
        }
        result.push(current)
    }

    return result
};