acquire-properties-from-array.js

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// Copyright (C) 2011 the V8 project authors. All rights reserved.

// This code is governed by the BSD license found in the LICENSE file.

/*---

es6id: 13.1

description: >

    for-in to acquire properties from array

---*/

function props(x) {

  var array = [];

  for (let p in x) array.push(p);

  return array;

var subject;

subject = props([]);

assert.sameValue(subject.length, 0, "[]: length");

assert.sameValue(subject[0], undefined, "[]: first property");

assert.sameValue(subject[1], undefined, "[]: second property");

assert.sameValue(subject[2], undefined, "[]: third property");

assert.sameValue(subject[3], undefined, "[]: fourth property");

subject = props([1]);

assert.sameValue(subject.length, 1, "[1]: length");

assert.sameValue(subject[0], "0", "[1]: first property");

assert.sameValue(subject[1], undefined, "[1]: second property");

assert.sameValue(subject[2], undefined, "[1]: third property");

assert.sameValue(subject[3], undefined, "[1]: fourth property");

subject = props([1, 2]);

assert.sameValue(subject.length, 2, "[1, 2]: length");

assert.sameValue(subject[0], "0", "[1, 2]: first property");

assert.sameValue(subject[1], "1", "[1, 2]: second property");

assert.sameValue(subject[2], undefined, "[1, 2]: third property");

assert.sameValue(subject[3], undefined, "[1, 2]: fourth property");

subject = props([1, 2, 3]);

assert.sameValue(subject.length, 3, "[1, 2, 3]: length");

assert.sameValue(subject[0], "0", "[1, 2, 3]: first property");

assert.sameValue(subject[1], "1", "[1, 2, 3]: second property");

assert.sameValue(subject[2], "2", "[1, 2, 3]: third property");

assert.sameValue(subject[3], undefined, "[1, 2, 3]: fourth property");

reportCompare(0, 0);