StackOverflow2013

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plurals

PO
primarykey
Id
12205134
data
AcceptedAnswerId
0
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0
ClosedDate
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1
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CreationDate
2012-08-30T20:40:44.063
FavoriteCount
0
LastActivityDate
2012-08-31T11:58:36.363
LastEditDate
2012-08-31T11:58:36.363
LastEditorUserId
140816
OwnerUserId
140816
ParentId
12204426
PostTypeId
2
Score
6
ViewCount
0
LastEditorDisplayName
text
Body
<h2><code>if ({}) alert('true')</code> -> <code>true</code></h2> <code>{}</code> is an object, which, when evaluated in the context of an <code>if</code> statement, gets coerced to a <code>Boolean</code>, and since <code>Boolean({})</code> evaluates to <code>true</code>, you get <code>if (true)</code>. This is documented in the ECMAScript specification, Section <a href="http://ecma-international.org/ecma-262/5.1/#sec-12.5" rel="nofollow">12.5 The if Statement</a>: <blockquote> The production If Statement : if ( Expression ) Statement is evaluated as follows: <ol> <li>Let exprRef be the result of evaluating Expression. </li> <li>If ToBoolean(GetValue(exprRef)) is false, return (normal, empty, empty).</li> <li>Return the result of evaluating Statement.</li> </ol> </blockquote> <h2><code>alert({} == true)</code> -> <code>false</code></h2> This one is more tricky. From the <a href="http://en.wikipedia.org/wiki/ECMAScript" rel="nofollow">ECMAScript</a> specification, Section <a href="http://ecma-international.org/ecma-262/5.1/#sec-11.9.3" rel="nofollow">11.9.3 The Abstract Equality Comparison Algorithm</a>: <blockquote> The comparison x == y, where x and y are values, produces true or false. Such a comparison is performed as follows: If Type(y) is Boolean, return the result of the comparison x == ToNumber(y). </blockquote> Thus, <code>{} == true</code> will be evaluated as <code>{} == Number(true)</code>, which is evaluated to <code>{} == 1</code>, which is <code>false</code>. This is also why <code>1 == true</code> evaluates to <code>true</code>, but <code>2 == true</code> evaluates to <code>false</code>.
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1. This table or related slice is empty.
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1. POIs {} == true or not in javascript?
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1. PTAnswer
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1. USJoão Silva
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1. USJoão Silva
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1. POIs {} == true or not in javascript?
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1. VO
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3. VO
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1. CO+1, much better explanation than what I had.
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