partition method full params for underscore.js
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var partitionIterator = function(array, n, step, pad, is_all, result) { | |
if (_.size(array) < n) { | |
if (_.isNull(pad) && is_all) return (_.isEmpty(array)) ? result : result.concat([array]); | |
else if (!_.isNull(pad) && !is_all) return result.concat([array.concat(_.take(pad, n - _.size(array)))]); | |
else return result; | |
} | |
else return partitionIterator(_.rest(array, step), n, step, pad, is_all, result.concat([_.take(array, n)])); | |
}; | |
_.mixin({ | |
partition: function(array, n, step, pad) { | |
var is_all = false, result = []; | |
if (!_.isNumber(n)) throw new TypeError; | |
if (!_.isUndefined(step) && !_.isNumber(step)) throw TypeError; | |
if (!_.isUndefined(pad) && !_.isArray(pad)) throw TypeError; | |
step = step ? step : n; | |
pad = pad ? pad : null; | |
return partitionIterator(array, n, step, pad, is_all, result); | |
}, | |
partitionAll: function(array, n, step) { | |
var pad = null, is_all = true, result = []; | |
if (!_.isNumber(n)) throw new TypeError; | |
if (!_.isUndefined(step) && !_.isNumber(step)) throw TypeError; | |
step = step ? step : n; | |
return partitionIterator(array, n, step, pad, is_all, result); | |
} | |
}); | |
/** | |
* Refs: | |
* partition -> http://clojuredocs.org/clojure_core/clojure.core/partition | |
* partitionAll -> http://clojuredocs.org/clojure_core/clojure.core/partition-all | |
*/ | |
_.partition(_.range(10), 3); // -> [[0, 1, 2], [3, 4, 5], [6, 7, 8]] | |
_.partition(_.range(10), 3, 2); // -> [[0, 1, 2], [2, 3, 4], [4, 5, 6], [6, 7, 8]] | |
_.partition(_.range(10), 4, 4, [1, 2, 3]); // -> [[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 1, 2]] | |
_.partitionAll(_.range(10), 3); // -> [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9]] | |
_.partitionAll(_.range(10), 3, 2); // -> [[0, 1, 2], [2, 3, 4], [4, 5, 6], [6, 7, 8], [8, 9]] | |
_.partitionAll(_.range(10), 2); // [[0, 1], [2, 3], [4, 5], [6, 7], [8, 9]] |
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