Run results for: object assign vs object spread vs immutable-js vs immutability-helper on large data set

Test name	Executions per second
object spread	27.8 Ops/sec
object assign	32.0 Ops/sec
immutable-js	407.6 Ops/sec
immutability-helper	68.4 Ops/sec

object spread

const obj = {};
for(i=0;i<100000;i++){
  obj[i] = 'some long string which will need to be copied';
}

const obj2 = {key: 'This is final object'}

const final = {obj2, ...obj};

object assign

const obj = {};
for(i=0;i<100000;i++){
  obj[i] = 'some long string which will need to be copied';
}

const obj2 = {key: 'This is final object'}

const final = Object.assign({}, obj2, obj)

immutable-js

const obj = {};
for(i=0;i<100000;i++){
  obj[i] = 'some long string which will need to be copied';
}
const immObj = Immutable.Map();

const obj2 = {key: 'This is final object'}

const final = immObj.set(obj2);

immutability-helper


var hasOwnProperty = Object.prototype.hasOwnProperty;
var splice = Array.prototype.splice;

var toString = Object.prototype.toString
var type = function(obj) {
  return toString.call(obj).slice(8, -1);
}

var assign = Object.assign || /* istanbul ignore next */ function assign(target, source) {
  getAllKeys(source).forEach(function(key) {
    if (hasOwnProperty.call(source, key)) {
      target[key] = source[key];
    }
  });
  return target;
};

var getAllKeys = typeof Object.getOwnPropertySymbols === 'function' ?
  function(obj) { return Object.keys(obj).concat(Object.getOwnPropertySymbols(obj)) } :
  /* istanbul ignore next */ function(obj) { return Object.keys(obj) };

/* istanbul ignore next */
function copy(object) {
  if (Array.isArray(object)) {
    return assign(object.constructor(object.length), object)
  } else if (type(object) === 'Map') {
    return new Map(object)
  } else if (type(object) === 'Set') {
    return new Set(object)
  } else if (object && typeof object === 'object') {
    var prototype = object.constructor && object.constructor.prototype
    return assign(Object.create(prototype || null), object);
  } else {
    return object;
  }
}

function newContext() {
  var commands = assign({}, defaultCommands);
  update.extend = function(directive, fn) {
    commands[directive] = fn;
  };
  update.isEquals = function(a, b) { return a === b; };

  return update;

  function update(object, spec) {
    if (typeof spec === 'function') {
      return spec(object);
    }

    if (!(Array.isArray(object) && Array.isArray(spec))) {
      
    }

   
    var nextObject = object;
    var index, key;
    getAllKeys(spec).forEach(function(key) {
      if (hasOwnProperty.call(commands, key)) {
        var objectWasNextObject = object === nextObject;
        nextObject = commands[key](spec[key], nextObject, spec, object);
        if (objectWasNextObject && update.isEquals(nextObject, object)) {
          nextObject = object;
        }
      } else {
        var nextValueForKey =
          type(object) === 'Map'
            ? update(object.get(key), spec[key])
            : update(object[key], spec[key]);
        if (!update.isEquals(nextValueForKey, nextObject[key]) || typeof nextValueForKey === 'undefined' && !hasOwnProperty.call(object, key)) {
          if (nextObject === object) {
            nextObject = copy(object);
          }
          if (type(nextObject) === 'Map') {
            nextObject.set(key, nextValueForKey);
          } else {
            nextObject[key] = nextValueForKey;
          }
        }
      }
    })
    return nextObject;
  }

}

var defaultCommands = {
  $push: function(value, nextObject, spec) {
  
    return value.length ? nextObject.concat(value) : nextObject;
  },
  $unshift: function(value, nextObject, spec) {
    // invariantPushAndUnshift(nextObject, spec, '$unshift');
    return value.length ? value.concat(nextObject) : nextObject;
  },
  $splice: function(value, nextObject, spec, originalObject) {
    // invariantSplices(nextObject, spec);
    value.forEach(function(args) {
    //   invariantSplice(args);
      if (nextObject === originalObject && args.length) nextObject = copy(originalObject);
      splice.apply(nextObject, args);
    });
    return nextObject;
  },
  $set: function(value, nextObject, spec) {
    // invariantSet(spec);
    return value;
  },
  $toggle: function(targets, nextObject) {
    // invariantSpecArray(targets, '$toggle');
    var nextObjectCopy = targets.length ? copy(nextObject) : nextObject;

    targets.forEach(function(target) {
      nextObjectCopy[target] = !nextObject[target];
    });

    return nextObjectCopy;
  },
  $unset: function(value, nextObject, spec, originalObject) {
    // invariantSpecArray(value, '$unset');
    value.forEach(function(key) {
      if (Object.hasOwnProperty.call(nextObject, key)) {
        if (nextObject === originalObject) nextObject = copy(originalObject);
        delete nextObject[key];
      }
    });
    return nextObject;
  },
  $add: function(value, nextObject, spec, originalObject) {
    // invariantMapOrSet(nextObject, '$add');
    // invariantSpecArray(value, '$add');
    if (type(nextObject) === 'Map') {
      value.forEach(function(pair) {
        var key = pair[0];
        var value = pair[1];
        if (nextObject === originalObject && nextObject.get(key) !== value) nextObject = copy(originalObject);
        nextObject.set(key, value);
      });
    } else {
      value.forEach(function(value) {
        if (nextObject === originalObject && !nextObject.has(value)) nextObject = copy(originalObject);
        nextObject.add(value);
      });
    }
    return nextObject;
  },
  $remove: function(value, nextObject, spec, originalObject) {
    // invariantMapOrSet(nextObject, '$remove');
    // invariantSpecArray(value, '$remove');
    value.forEach(function(key) {
      if (nextObject === originalObject && nextObject.has(key)) nextObject = copy(originalObject);
      nextObject.delete(key);
    });
    return nextObject;
  },
  $merge: function(value, nextObject, spec, originalObject) {
    // invariantMerge(nextObject, value);
    getAllKeys(value).forEach(function(key) {
      if (value[key] !== nextObject[key]) {
        if (nextObject === originalObject) nextObject = copy(originalObject);
        nextObject[key] = value[key];
      }
    });
    return nextObject;
  },
  $apply: function(value, original) {
    // invariantApply(value);
    return value(original);
  }
};

var contextForExport = newContext();


const obj = {};
for(i=0;i<100000;i++){
  obj[i] = 'some long string which will need to be copied';
}

const obj2 = {key: 'This is final object'}

const final = contextForExport(obj2, {$merge: obj});