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COLLECTIONS (MAPS
vergelijkbaar met object
type keys is eender (map.get
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COLLECTIONS
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ARRAYS
MAP
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arrayName.map((value, index, array) => {return value.name; });
FILTER
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arrayName.filter((value,index, array) => {return value.criterium=== [criterium];});
REDUCE
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arrayName.reduce(result,value, index, array) => { return (result += value.criterium);},0);
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