js performance

interpeter.js

var queryMatch = function (doc, query) {
  return Object.keys(query).every(function(name) {
    return propertyMatch(doc, name, query[name])
  })
}

var propertyMatch = function (doc, name, prop) {
  return Object.keys(prop).every(function(op) {
    switch(op) {
      case '$eq':
        return doc[name] === prop[op]
      case '$lt':
        return doc[name] < prop[op]
      case '$gt':
        return doc[name] > prop[op]
      case '$not':
        return !propertyMatch(doc, name, prop[op])
    }
    return false
  })
}

module.exports = function (query) {
  return function (doc) {
    return queryMatch(doc, query);
  }
}

test.js

var interpeter = require('./interpeter')
var assert = require('assert')

var matcher = interpeter({
  hello: {
    $eq: 'world'
  }
})

var bool = matcher({
  hello: 'world'
})

assert(bool === true)

var bool2 = matcher({
  hello: 'verden'
})

assert(bool2 === false)

var matcher2 = interpeter({
  age: {
    $lt: 10
  }
})

var bool3 = matcher2({
  age: 5
})

assert(bool3 === true)

var bool4 = matcher2({
  age: 15
})

assert(bool4 === false)


var matcher3 = interpeter({
  hello: {
    $not: {
      $eq: 'world'
    }
  }
})

var bool5 = matcher3({
  hello: 'verden'
})

assert(bool5 === true)
var bool6 = matcher3({
  hello: 'world'
})

assert(bool6 === false)