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<!DOCTYPE html><html><head><meta charset="utf-8"><title>Boolean JavaScript API</title><meta name="description" content="Interactive API reference for the JavaScript Boolean Object. A true or false value."><link rel="stylesheet" type="text/css" href="styles.css"><script type="text/javascript">var _gaq = _gaq || [];
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var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();</script></head><body><script>if (sessionStorage.collapsed === 'true') {
document.body.classList.add('members-collapsed');
}
if (localStorage.theme) {
document.body.parentElement.classList.add(localStorage.theme);
}</script><div class="topnav"><a href="/">JavaScripture</a><div class="bookmarks"><a class="bookmark contribute" href="https://github.com/nkronlage/JavaScripture">Contribute via GitHub</a> <a class="bookmark" href="/feedback">Feedback</a></div></div><div class="container"><nav class="leftnav"><div id="searchContainer"><input id="searchBox" type="text" placeholder="Search (Ctrl + S)" autocomplete="false"><div id="resultsBox" style="display:none;"></div></div><div id="apichooser"><a href="#" onclick="openApiChooser(); return false;"><div class="arrow"></div><span id="selectedsets"></span></a><div id="obscure"></div><div id="apisets"><ul></ul></div></div><div class="toc"><h2>Boolean</h2><div class="navgroup"><div class="group"><a href="#Constructors">Constructors</a></div><div class="group collapsed"><a href="#InstanceMethods" onclick="expandoClicked(this.parentNode); return false;"><div class="arrow"></div>Instance Methods</a><div class="subgroup"><a href="#toString_">toString</a></div></div></div><h2>JavaScript API</h2><div id="related-apis" class="navgroup"></div><h2>All API</h2><div id="rootObjs" class="navgroup"><span class="empty">No API set selected.</span></div></div></nav><div class="content"><h1 class="declaration"><span class="object">Boolean</span> <span class="type">: <a href="/Object">Object</a></span></h1><div class="metadata"><span>constructor</span> <span>primitive</span></div><div class="objectdescription">A true or false value.<div class="membermetadata"><a href="http://www.ecma-international.org/ecma-262/5.1/#sec-15.6" class="spec">Spec</a></div></div><div><a name=""></a><h2></h2><div class="member"><div class="expand-members" title="Toggle showing all descriptions and examples"></div><a name="Boolean"></a> <a name="Boolean_Object"></a><div class="declaration"><span class="membername primary">Boolean</span>(<span class="membername">value</span> : <a class="membertype" href="/Object">Object</a>) : <a class="membertype" href="/Boolean">Boolean</a></div><div class="member-body"><p class="description">Coerces <code>value</code> into a boolean value. You can also use <code>!!value</code> to do the coercion. Note <code>'false'</code> coerces to <code>true</code> since it is a non-empty string. Use <code>value === 'true'</code> to convert a string to a Boolean.</p><div class="example"><div class="codePanel"><h4>Example:</h4><textarea class="code" rows="12" cols="60" wrap="off">
console.log(Boolean(''));
console.log(Boolean('0'));
console.log(Boolean(0));
console.log(Boolean(1));
console.log(Boolean([]));
console.log(Boolean(undefined));
console.log(!!undefined);
console.log();
var stringToBoolean = function(value) {
return value === 'true';
};
console.log(Boolean('false'));
console.log(stringToBoolean('false'));
</textarea><a onclick='executeExample(this.parentNode.parentNode, "Boolean.Boolean"); return false' href="#" class="run">Run</a></div><div class="resultsPanel"><h4>Results:</h4><div style="position: relative"><div class="errormessage" style="display: none"></div><pre class="results"> </pre></div></div></div><p></p><div class="membermetadata"><a href="http://www.ecma-international.org/ecma-262/5.1/#sec-15.6.1" class="spec">Spec</a></div></div></div></div><div><a name="Constructors"></a><h2>Constructors</h2><div class="member"><div class="expand-members" title="Toggle showing all descriptions and examples"></div><a name="Boolean"></a> <a name="new_Boolean_Object"></a><div class="declaration">new <span class="membername primary">Boolean</span>(<span class="membername">value</span> : <a class="membertype" href="/Object">Object</a>) : <a class="membertype" href="/Object">Object</a></div><div class="member-body"><p class="description">Creates a box for a boolean value.</p><div class="example"><div class="codePanel"><h4>Example:</h4><textarea class="code" rows="12" cols="60" wrap="off">
var literal = true;
var boxed = new Boolean(true);
console.log(literal === true);
console.log(boxed === true);
console.log(boxed.valueOf() === true);
console.log();
// Literals cannot hold other properties but boxes can
literal.foo = 'bar';
boxed.foo = 'bar';
console.log(literal.foo);
console.log(boxed.foo);
</textarea><a onclick='executeExample(this.parentNode.parentNode, "Boolean.Boolean"); return false' href="#" class="run">Run</a></div><div class="resultsPanel"><h4>Results:</h4><div style="position: relative"><div class="errormessage" style="display: none"></div><pre class="results"> </pre></div></div></div><p></p><div class="membermetadata"><a href="http://www.ecma-international.org/ecma-262/5.1/#sec-15.6.2" class="spec">Spec</a></div></div></div></div><div><a name="InstanceMethods"></a><h2>Instance Methods</h2><div class="member"><div class="expand-members" title="Toggle showing all descriptions and examples"></div><a name="toString"></a> <a name="toString_"></a><div class="declaration"><span class="membername primary">toString</span>() : <a class="membertype" href="/String">String</a></div><div class="member-body"><p class="description">Returns a string representation of <code>this</code>.</p><div class="example"><div class="codePanel"><h4>Example:</h4><textarea class="code" rows="12" cols="60" wrap="off">
console.log(true.toString());
console.log(false.toString());
</textarea><a onclick='executeExample(this.parentNode.parentNode, "Boolean.toString"); return false' href="#" class="run">Run</a></div><div class="resultsPanel"><h4>Results:</h4><div style="position: relative"><div class="errormessage" style="display: none"></div><pre class="results"> </pre></div></div></div><p></p><div class="membermetadata"><a href="http://www.ecma-international.org/ecma-262/5.1/#sec-15.6.4.2" class="spec">Spec</a></div></div></div></div><div class="bottomnav"><a href="/">home</a> <a href="/license">license</a> <a href="https://github.com/nkronlage/JavaScripture">contribute</a> <a href="/feedback">feedback</a> <a id="toggle-theme" href="#">toggle light/dark mode</a></div><div class="copyright">Copyright © JavaScripture Contributors</div></div></div></body><script src="javascripture.js"></script></html>