Add aafeApplyFunctionsRest

bench-sam.js

function applyFunctionsRest(functions, ...args) {
  for (var i = 0, l = functions.length; i < l; ++i) {
    functions[i].apply(this, args);
  }
}

var safeApply = Function.prototype.call.bind(Function.prototype.apply);

function safeApplyFunctionsRest(functions, ...args) {
  for (var i = 0, l = functions.length; i < l; ++i) {
    safeApply(functions[i], this, args);
  }
}

function applyFunctionsRestSpread(functions, ...args) {
  for (var i = 0, l = functions.length; i < l; ++i) {
    functions[i].call(this, ...args);
  }
}

function applyFunctionsSlice(functions) {
  "use strict";
  var args = Array.prototype.slice.call(arguments, 1);
  for (var i = 0, l = functions.length; i < l; ++i) {
    functions[i].apply(this, args);
  }
}

function applyFunctionsSwitch(functions, param1, param2) {
  "use strict";
  for (var i = 0, l = functions.length; i < l; ++i) {
    switch (arguments.length) {
      case 1:
        functions[i].call(this);
        break;
      case 2:
        functions[i].call(this, param1);
        break;
      case 3:
        functions[i].call(this, param1, param2);
        break;
      default:
        functions[i].apply(this, Array.prototype.slice.call(arguments, 1));
        break;
    }
  }
}

function applyFunctionsSwitchOptimized(functions, param1, param2) {
  "use strict";
  switch (arguments.length) {
    case 1:
      for (var i = 0, l = functions.length; i < l; ++i) {
        functions[i].call(this);
      }
      break;
    case 2:
      for (var i = 0, l = functions.length; i < l; ++i) {
        functions[i].call(this, param1);
      }
      break;
    case 3:
      for (var i = 0, l = functions.length; i < l; ++i) {
        functions[i].call(this, param1, param2);
      }
      break;
    default: {
      var args = new Array(arguments.length - 1);
      for (var i = 0; i < arguments.length - 1; ++i) {
        args[i] = arguments[i + 1];
      }
      for (var i = 0, l = functions.length; i < l; ++i) {
        functions[i].apply(this, args);
      }
      break;
    }
  }
}

const applyFunctions = [
  applyFunctionsRest,
  safeApplyFunctionsRest,
  applyFunctionsRestSpread,
  applyFunctionsSlice,
  applyFunctionsSwitch,
  applyFunctionsSwitchOptimized
];

const n = 1e6;

function test(applyFun) {
  const fns = [x => x, (x, y) => y, (x, y, z) => z, (x, y, z, w) => w];
  for (var i = 0; i < n; ++i) {
    applyFun(fns);
    applyFun(fns, i);
    applyFun(fns, i, i);
    applyFun(fns, i, i, i);
  }
}

// Warmup
for (const applyFun of applyFunctions) {
  test(applyFun);
}

// Measure
for (const applyFun of applyFunctions) {
  console.time(applyFun.name);
  test(applyFun);
  console.timeEnd(applyFun.name);
}