calling-from-valid-2.js

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// |reftest| skip-if(!this.hasOwnProperty("Tuple"))

var list = {

  '0': 41,

  '1': 42,

  '2': 43,

  length: 3

};

var calls = [];

var thisArg = {};

function mapFn(value) {

  calls.push({

    args: arguments,

    thisArg: this

});

  return value * 2;

var result = Tuple.from(list, mapFn, thisArg);

assertEq(result.length, 3);

assertEq(result[0], 82);

assertEq(result[1], 84);

assertEq(result[2], 86);

assertEq(calls.length, 3);

assertEq(calls[0].args.length, 2);

assertEq(calls[0].args[0], 41);

assertEq(calls[0].args[1], 0);

assertEq(calls[0].thisArg, thisArg);

assertEq(calls[1].args.length, 2);

assertEq(calls[1].args[0], 42);

assertEq(calls[1].args[1], 1);

assertEq(calls[1].thisArg, thisArg);

assertEq(calls[2].args.length, 2);

assertEq(calls[2].args[0], 43);

assertEq(calls[2].args[1], 2);

assertEq(calls[2].thisArg, thisArg);

reportCompare(0, 0);