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    <p><strong>herby</strong>'s excellent answer points out the <strong>recommended</strong> way to do it. Appearently, there is now Dictionary-literal support (see his comment below). Didn't know that :-)</p> <h2>Old / Alternate way of doing it</h2> <p>For historical reasons, or for users not using the latest master version, this is an alternative way to do it:</p> <pre><code>options := &lt;{}&gt;. options at: #axis put: 'y'. '#draggable' asJQuery draggable: options. </code></pre> <p>The first line constructs an empty JavaScript object (it's really an <code>JSObjectProxy</code>).</p> <p>The second line puts the string "y" in the slot "axis". It has the same effect as:</p> <pre><code>options.axis = "y"; // JavaScript </code></pre> <p>Lastly, it is invoked, and passed as a parameter.</p> <h2>Array-literals vs Dictionaries</h2> <p>What you were doing didn't work because in modern Smalltalk (Pharo/Squeak/Amber) the curly-brackets are used for array-literals, not as an object-literal as they are used in JavaScript.</p> <p>If you evaluate (print-it) this in a Workspace:</p> <pre><code>{ #elelemt1. #element2. #element3 }. </code></pre> <p>You get:</p> <pre><code>a Array (#elelemt1 #element2 #element3) </code></pre> <p>As a result, if you have something that <em>looks</em> like a JavaScript object-literal in reality it is an Array of Association(s). To illustrate I give you this snippet, with the results of print-it on the right:</p> <pre><code>arrayLookingLikeObject := { #key1 -&gt; #value1. #key2 -&gt; #value2. #key3 -&gt; #value3}. arrayLookingLikeObject class. "==&gt; Array" arrayLookingLikeObject first class. "==&gt; Association" arrayLookingLikeObject "==&gt; a Array (a Association a Association a Association)" </code></pre> <p>I wrote about it here:</p> <p><a href="http://smalltalkreloaded.blogspot.co.at/2012/04/javascript-objects-back-and-forth.html" rel="nofollow">http://smalltalkreloaded.blogspot.co.at/2012/04/javascript-objects-back-and-forth.html</a></p>
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    1. POPassing options to JS function with Amber
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    1. COFYI: It is not a `Dictionary` literal, it is `HashedCollection` literal, which is superclass of `Dictionary` in Smalltalk hierarchy, has the limitation that only strings can be keys, and is implemented so that it wraps an actual JavaScript object.
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