feat: collect and collectFirst (Scala style map+filter) - #497
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Closes sodiray#269. Add collect(array, fn): a map+filter combo that maps array through fn and keeps only results that are not undefined (the issue's example: collect([{a:1},{b:2},{a:3}], el => el.a) to [1,3]). And collectFirst(array, fn): returns the first defined result (or undefined if none), short circuiting (collectFirst([{a:1},{b:2},{a:3}], el => el.a) to 1).
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Closes #269.
Add collect(array, fn): a map+filter combo that maps array through fn and keeps only results that are not undefined (the issue's example: collect([{a:1},{b:2},{a:3}], el => el.a) to [1,3]). And collectFirst(array, fn): returns the first defined result (or undefined if none), short circuiting (collectFirst([{a:1},{b:2},{a:3}], el => el.a) to 1).