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Line 467: </syntaxhighlight> [[Array data structure\|Arrays]] are implemented so that only the defined elements use memory; they are "[[sparse array]]s". Setting {{~~Unstyled inline syntax\|monospace=true~~code\|lang=javascript\|code=myArray[10] = 'someThing'}} and {{~~Unstyled inline syntax\|monospace=true~~code\|lang=javascript\|code=myArray[57] = 'somethingOther'}} only uses space for these two elements, just like any other object. The <tt>length</tt> of the array will still be reported as 58. One can use the object declaration literal to create objects that behave much like associative arrays in other languages:

JavaScript syntax: Difference between revisions