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length-Property__String.html
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length-Property__String.html
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<?xml version="1.0" encoding="utf-8"?><html xmlns:xsl="urn:schemas-microsoft-com:xslt" xmlns:MSHelp="http://msdn.microsoft.com/mshelp" xmlns:mshelp="http://msdn.microsoft.com/mshelp" xmlns:ms-help="http://msdn.microsoft.com/mshelp" xmlns:t="http://www.microsoft.com/topic/t" xmlns:msie="http://www.microsoft.com/ie/msie" xmlns:ddue="http://ddue.schemas.microsoft.com/authoring/2003/5" xmlns:tool="http://www.microsoft.com/tooltip" xmlns:mso="urn:schemas-microsoft-com:office:office" xmlns:o="urn:schemas-microsoft-com:office:dvraddata" xmlns:u1="http://www.microsoft.com/vs/dvvwdcon" xmlns:anim="http://www.microsoft.com/windowssdk/anim" xmlns:w="http://www.microsoft.com/windows/w" xmlns:v="http://www.microsoft.com/windows/v" xmlns:msxsl="http://www.microsoft.com/aspnet/cpguide" xmlns:st1="http://www.microsoft.com/webservices/mscomwssdkproject" xmlns:ds="http://www.microsoft.com/xml/xmlsdk/ds" xmlns:xsd="http://www.microsoft.com/xml/xmlsdk/xsd" xmlns:xdr="http://www.microsoft.com/xml/xmlsdk/xdr" xmlns:sql="http://www.microsoft.com/sql/xmlsql" xmlns:ph="http://www.microsoft.com/ph/placeholder" xmlns:xlink="http://www.w3.org/1999/xlink"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><meta name="save" content="history" /><title>length Property (String) (JavaScript)</title><meta name="Language" content="en-us" /><meta name="System.Keywords" content="Length property" /><meta name="System.Keywords" content="length property (String)" /><meta name="System.Keywords" content="strings [Visual Studio], length" /><meta name="Microsoft.Help.F1" content="length Property" /><meta name="Microsoft.Help.Id" content="7dbd4a0e-c24e-4561-9b5b-e75e649a10a4" /><meta name="Description" content="Returns the length of a String object." /><meta name="Microsoft.Help.ContentType" content="Reference" /><meta name="Refinement.TopicID" content="196" /><meta name="DCSext.ProductFamily" content="LIB_DG" /><meta name="DCSext.Product" content="VS_JScript" /><meta name="DCSext.Title" content="length Property (String) (JavaScript)" /><link rel="stylesheet" type="text/css" href="../styles/presentation.css" /><link rel="stylesheet" type="text/css" href="ms-help://Hx/HxRuntime/HxLink.css" /><script type="text/javascript" src="../scripts/EventUtilities.js"><![CDATA[ ]]></script><script type="text/javascript" src="../scripts/SplitScreen.js"><![CDATA[ ]]></script><script type="text/javascript" src="../scripts/Dropdown.js"><![CDATA[ ]]></script><script type="text/javascript" src="../scripts/script_manifold.js"><![CDATA[ ]]></script><script type="text/javascript" src="../scripts/script_feedBack.js"><![CDATA[ ]]></script><script type="text/javascript" src="../scripts/CheckboxMenu.js"><![CDATA[ ]]></script><script type="text/javascript" src="../scripts/CommonUtilities.js"><![CDATA[ ]]></script><xml><mshelp:toctitle title="length Property (String)" /><mshelp:keyword index="A" term="7dbd4a0e-c24e-4561-9b5b-e75e649a10a4" /><mshelp:keyword index="K" term="Length property" /><mshelp:keyword index="K" term="length property (String)" /><mshelp:keyword index="K" term="strings [Visual Studio], length" /><mshelp:keyword index="F" term="length Property" /><mshelp:attr name="RevisionNumber" value="8" /><mshelp:attr name="AssetID" value="7dbd4a0e-c24e-4561-9b5b-e75e649a10a4" /><mshelp:attr name="Abstract" value="Returns the length of a String object. 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<a href="javascript:SubmitFeedback('DevDocs@Microsoft.com','','','','8.0.13105.10000','%0\dThank%20you%20for%20your%20feedback.%20The%20developer%20writing%20teams%20use%20your%20feedback%20to%20improve%20documentation.%20While%20we%20are%20reviewing%20your%20feedback,%20we%20may%20send%20you%20e-mail%20to%20ask%20for%20clarification%20or%20feedback%20on%20a%20solution.%20We%20do%20not%20use%20your%20e-mail%20address%20for%20any%20other%20purpose%20and%20we%20delete%20it%20after%20we%20finish%20our%20review.%0\AFor%20further%20information%20about%20the%20privacy%20policies%20of%20Microsoft,%20please%20see%20http://privacy.microsoft.com/en-us/default.aspx.%0\A%0\d','Customer%20Feedback');">
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</td></tr></table><table id="gradientTable"><tr><td class="nsrBottom" background="../icons/gradient.gif" /></tr></table></div><div id="mainSection"><div id="mainBody"><div id="allHistory" class="saveHistory" onsave="saveAll()" onload="loadAll()" /><font color="DarkGray"><p /></font> <div class="introduction"><p xmlns:util="util">Returns the length of a <b>String</b> object. </p><div class="alert"><table width="100%" cellspacing="0" cellpadding="0"><tr><th align="left"><img class="note" alt="Caution note" title="Caution note" src="../icons/alert_caution.gif" /><b>Caution</b></th></tr><tr><td><p xmlns:util="util">JavaScript strings are immutable, so the length of a string cannot be modified.</p></td></tr></table></div></div><div id="syntaxSection" class="section"><div id="syntaxCodeBlocks" class="code"><span codelanguage="other"><table width="100%" cellspacing="0" cellpadding="0"><tr><th align="left" /></tr><tr><td><pre><span class="parameter" sdata="paramReference" xmlns:util="util">strVariable</span>.length
"String Literal".length </pre></td></tr></table></span></div></div><h1 class="heading"><span onclick="ExpandCollapse(languageReferenceRemarksToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(languageReferenceRemarksToggle, event)" tabindex="0"><img id="languageReferenceRemarksToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />Remarks</span></h1><div id="languageReferenceRemarksSection" class="section" name="collapseableSection" style=""><p xmlns:util="util">The <b>length</b> property contains an integer that indicates the number of characters in the <b>String</b> object. The last character in the <b>String</b> object has an index of i<b>length</b> - 1.</p></div><h1 class="heading"><span onclick="ExpandCollapse(exampleToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(exampleToggle, event)" tabindex="0"><img id="exampleToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />Example</span></h1><div id="exampleSection" class="section" name="collapseableSection" style=""><p xmlns:util="util">The following code shows how to use <b>length</b>. JavaScript strings are immutable and cannot be modified in place. However, you can write the reversed string to an array and then call <b>join</b> with the empty character, which produces a string with no separator characters.</p><div class="code"><span codelanguage="JavaScript"><table width="100%" cellspacing="0" cellpadding="0"><tr><th>JavaScript </th><th><span class="copyCode" onclick="CopyCode(this)" onkeypress="CopyCode_CheckKey(this, event)" onmouseover="ChangeCopyCodeIcon(this)" onmouseout="ChangeCopyCodeIcon(this)" tabindex="0"><img class="copyCodeImage" name="ccImage" align="absmiddle" alt="Copy image" title="Copy image" src="../icons/copycode.gif" />Copy Code</span></th></tr><tr><td colspan="2"><pre>var str = "every good boy does fine";
var start = 0;
var end = str.length - 1;
var tmp = "";
var arr = new Array(end);
while (end >= 0) {
arr[start++] = str.charAt(end--);
}
// Join the elements of the array with a
var str2 = arr.join('');
document.write(str2);
// Output: enif seod yob doog yreve
</pre></td></tr></table></span></div></div><h1 class="heading"><span onclick="ExpandCollapse(requirementsTitleToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(requirementsTitleToggle, event)" tabindex="0"><img id="requirementsTitleToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />Requirements</span></h1><div id="requirementsTitleSection" class="section" name="collapseableSection" style=""><p xmlns:util="util">
</p><p>Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards. Also supported in Windows Store apps. See <mshelp:link keywords="440f4924-f7a9-48e0-873e-bd599a93b437" tabindex="0">Version Information</mshelp:link>.</p>
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