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partition array filter - distribute an array into columns #angularjs #array #partition #columns
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Example usage: <!-- ngRepeat: thing in things | limitTo:6 | partition:3 --> | |
limitTo = max items to return | |
partition = how many arrays | |
.filter('partition', [ '$cacheFactory', function($cacheFactory) { | |
var arrayCache = $cacheFactory('partition'); | |
var filter = function(arr, size) { | |
if (!arr) { return; } | |
var newArr = []; | |
for (var i=0; i<arr.length; i+=size) { | |
newArr.push(arr.slice(i, i+size)); | |
} | |
var cachedParts; | |
var arrString = JSON.stringify(arr); | |
cachedParts = arrayCache.get(arrString+size); | |
if (JSON.stringify(cachedParts) === JSON.stringify(newArr)) { | |
return cachedParts; | |
} | |
arrayCache.put(arrString+size, newArr); | |
return newArr; | |
}; | |
return filter; | |
}]) |
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