acquire-properties-from-object.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 object

---*/

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({x:1});

assert.sameValue(subject.length, 1, "{x:1}: length");

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

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

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

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

subject = props({x:1, y:2});

assert.sameValue(subject.length, 2, "{x:1, y:2}: length");

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

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

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

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

subject = props({x:1, y:2, zoom:3});

assert.sameValue(subject.length, 3, "{x:1, y:2, zoom:3}: length");

assert.sameValue(subject[0], "x", "{x:1, y:2, zoom:3}: first property");

assert.sameValue(subject[1], "y", "{x:1, y:2, zoom:3}: second property");

assert.sameValue(subject[2], "zoom", "{x:1, y:2, zoom:3}: third property");

assert.sameValue(subject[3], undefined, "{x:1, y:2, zoom:3}: fourth property");

reportCompare(0, 0);