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POJavascript arrays and Meteor session
 

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    <p>I have made an interesting observation. When trying to update an array that is stored in the Meteor session storage, the following code will not propagate the changes:</p> <pre><code>var tags = Session.get("Tags"); tags.push("a"); Session.set("Tags", tags); </code></pre> <p>But if I change the first line to use <code>Session.get("Tags").slice()</code>, everything depending on the session will update accordingly. I guess this is due to the fact that Meteor tests some references for equality and therefore does not update anything.</p> <p><strong>Is there a better way to manage lists stored in the meteor session store?</strong></p> <p>If I now try to remove an element from the collection (using <code>array.remove()</code> from <a href="http://ejohn.org/blog/javascript-array-remove/" rel="noreferrer">here</a>), the behavior turns out to be a bit ... of ... I am doing this inside a Meteor template event, the code looks like this:</p> <pre><code>"click .taglist li" : function(e) { var tags = Session.get("Tags").slice(); var index = cardTags.indexOf(this); Meteor._debug(Session.get("Tags").slice().indexOf("a")); Meteor._debug("Removing tag \"" + this + "\", index: " + index, ", typeof(this) = " + typeof(this).toString()); tags.remove(index); Session.set("Tags", tags); } </code></pre> <p>This outputs:</p> <pre><code>1 Removing tag "a", index: -1, typeof(this) = string </code></pre> <p>So somehow, the <code>cardTags.indexOf(this);</code> statement seems to return <code>-1</code> for almost any case. I guess I am doing something fundamentally wrong, as I am quite now to javascript, but somehow I can not figure out whats going on here.</p> <p><strong>Why will those two calls to indexOf() behave different?</strong></p>
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