dataFilter.js

dataFilter.js

/**
 * order, orderBy, search by text, and set offset / limit for array of objects (depth = 1)
 */

const sample = [
  {
    name: "cDudeson",
    age: 32
  },
  {
    name: "aDeedee",
    age: 32
  },
  {
    name: "bJed",
    age: 21
  }
]

const dataFilter = (data, searchText, orderBy, order, offset=0, limit=0, searchFields=[]) => {
  return new Promise((resolve, reject) => {
    if (!Array.isArray(data)) {
      return reject('data must be an array')
    }
    // filter by searchText
    let filtered = data.filter((elem) => {
      const match = new RegExp(searchText, 'i')
      let keys = searchFields.length !== 0 ? searchFields : Object.keys(elem)
      for (let ii in keys) {
        if (match.test(elem[keys[ii]])) {
          return elem
        }
      }
    })
    const dataLength = filtered.length
    let ordered = filtered.sort(sortCompareObject(orderBy, order))
    let result = ordered
    if (limit && !offset) {
      result = ordered.splice(0, limit)
    }
    else if (!limit && offset) {
      result = ordered.splice(offset)
    }
    else if (limit && offset) {
      result = ordered.splice(offset, limit)
    }
    resolve({
      data: result,
      totalPages: !limit ? (!dataLength ? 0 : 1) : Math.ceil(dataLength / limit),
      totalCounts: dataLength
    })
  })
}

const sortCompareObject = (key, order = 'ASC') => {
  return function compare(l, r) {
    if (!l.hasOwnProperty(key) || !r.hasOwnProperty(key)) {
      return 0
    }
    const lVal = typeof l[key] === 'string' ? l[key].toUpperCase() : l[key]
    const rVal = typeof r[key] === 'string' ? r[key].toUpperCase() : r[key]
    let evaluator = 0
    if (lVal > rVal) {
      evaluator = 1
    }
    else if (lVal < rVal) {
      evaluator = -1
    }
    return order === 'DESC' ? evaluator * -1 : evaluator
  }
}

dataFilter(sample, '', 'name', 'ASC', 0, 5)
.then((data) => {
  console.log(data)
})