js-benchmark/benchmarks/object-shallow-compare.js at master · romgrk/js-benchmark · GitHub

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const nObjects = 64

const nKeys         = PROCESS_ARGS[1] ? +PROCESS_ARGS[1] : 15
const generateKey   = PROCESS_ARGS[2] === 'same-shape'  ? (index) => index : () => Math.random()
const generateValue = PROCESS_ARGS[3] === 'same-values' ? (index) => index : () => Math.random()

function generateMono(nKeys) {
  return Array.from({ length: nObjects }).map(() =>
    Array.from({ length: nKeys }).reduce((acc, curr, index) => {
      acc['key' + generateKey(index)] = generateValue(index)
      return acc
    }, {})
  )
}


const inputs = generateMono(nKeys)


function shallowDiffers(a, b) {
  for (let i in a) if (i !== '__source' && !(i in b)) return true;
  for (let i in b) if (i !== '__source' && a[i] !== b[i]) return true;
  return false;
}

function shallowDiffers_reverse(a, b) {
  for (let i in a) if (i !== '__source' && a[i] !== b[i]) return true;
  for (let i in b) if (i !== '__source' && !(i in a)) return true;
  return false;
}

function fastObjectShallowEqual(a, b) {
  let aLength = 0;
  let bLength = 0;

  for (const key in a) {
    if (key === '__source') { continue }

    aLength += 1;

    if (a[key] !== b[key]) {
      return false;
    }
    if (!(key in b)) {
      return false;
    }
  }

  for (const key in b) {
    if (key === '__source') { continue }
    bLength += 1;
  }
  return aLength === bLength;
}

export default {
  blocks: [
    {
      id: 'shallowDiffers',
      setup: () => {
        const a = inputs[0]

        return () => {
          let result = 0

          for (let i = 0; i < inputs.length - 1; i++) {
            const b = inputs[i]
            if (!shallowDiffers(a, b)) {
              result += 1
            }
          }

          return result
        }
      }
    },
    {
      id: 'shallowDiffers_reverse',
      setup: () => {
        const a = inputs[0]

        return () => {
          let result = 0

          for (let i = 0; i < inputs.length - 1; i++) {
            const b = inputs[i]
            if (!shallowDiffers_reverse(a, b)) {
              result += 1
            }
          }

          return result
        }
      }
    },
    {
      id: 'fastObjectShallowEqual',
      setup: () => {
        const a = inputs[0]

        return () => {
          let result = 0

          for (let i = 0; i < inputs.length - 1; i++) {
            const b = inputs[i]
            if (fastObjectShallowEqual(a, b)) {
              result += 1
            }
          }

          return result
        }
      }
    },
  ]
}