File size: 2,229 Bytes
4b876a7 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | function Collection() {
var items = [];
var self = {
add: function add(item) {
items.push(item);
},
insert: function insert(index, item) {
items.splice(index, 0, item);
},
removeAtIndex: function removeAtIndex(index) {
items.splice(index, 1);
},
unshift: function unshift(item) {
items.unshift(item);
},
shift: function shift() {
return items.shift();
},
clear: function clear() {
items.length = 0;
},
indexOf: function indexOf(item) {
return items.indexOf(item);
},
getAtIndex: function getAtIndex(index) {
return items[index];
},
getLast: function getLast() {
return items[items.length - 1];
},
forEach: function forEach(userFunction) {
var itemsCopy = items.slice(0);
itemsCopy.forEach(userFunction);
},
asyncForEach: function asyncForEach(userFunction, callback) {
var itemsCopy = items.slice(0);
function iterate() {
if (itemsCopy.length > 0) {
processItem();
} else {
callback();
}
}
function processItem() {
var item = itemsCopy.shift();
userFunction(item, function () {
iterate();
});
}
iterate();
},
syncMap: function map(userFunction) {
var newCollection = new Collection();
items.map(function (item) {
newCollection.add(userFunction(item));
});
return newCollection;
},
sort: function sort(comparator) {
var sortedItems = items.sort(comparator);
var sortedCollection = new Collection();
sortedItems.forEach(function (item) {
sortedCollection.add(item);
});
return sortedCollection;
},
length: function length() {
return items.length;
},
toArray: function toArray() {
return items.slice(0);
},
filter: function (predicate) {
var filteredItems = items.filter(predicate);
var filteredCollection = new Collection();
filteredItems.forEach(function (item) {
filteredCollection.add(item);
});
return filteredCollection;
}
};
return self;
}
module.exports = Collection;
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