Hi Michael, Anonymous functions would've been quite nice, but could your example only be used for a single argument?
Op 2 aug. 2017 17:44 schreef "Michael Kay" <m...@saxonica.com>: > > To put things in perspective, => was introduced in version 3.1, together with map and array support. As far as I understand it and looking again at the specs, one of the use cases is for => to be used with maps and arrays, in an object-oriented style. In particular, arrays don't have a filter operator in the way that sequences do, neither do they have a mapping operator, so to select into an array of maps you need to do things like $A => a:filter( function($m) {$m?name='Mike'}) => a:for-each( function($m) { $m?age }) which gets terribly unwieldy if you try to write it with conventional nested function calls. I wish we had done a concise anonymous function declaration as well: $A => a:filter( {?name='Mike'} ) => a:for-each( {?age} ) Here {EXPR} is shorthand for "function($x){ $x ! EXPR }" but that would have been a bridge too far for some people. Michael Kay Saxonica
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