js-实现集合的操作
2016-01-12 19:01
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function Set() {
var items = {};
this.has = function (value) {
return items.hasOwnProperty(value);
};
this.add = function (value) {//添加值
if (!this.has(value)) {
items[value]=value;
return false;
}
};
this.remove = function (value) {//删除某个值
if (this.has(value)) {
delete items[value];
return true;
}
return false;
};
this.clear = function () {//清除
items = {};
};
this.size = function () {
return Object.keys(items).length;
};
this.sizeLegacy = function () {//返回集合中有多少项
var count = 0;
for (var prop in items) {
if (items.hasOwnProperty(prop)) {
++count;
}
}
return count;
};
this.valueLegacy = function () {//输出现有值
var keys = [];
for (var key in items) {
keys.push(key);
}
return keys;
};
this.getItems = function () {
return items;
};
this.union = function (otherSet) {//合并集合
var unionSet = new Set();
var values = this.values();
for (var i = 0; i < values.length; i++) {
unionSet.add(values[i]);
}
values = otherSet.values();
for (var i = 0; i < values.length; i++) {
unionSet.add(values[i]);
}
return unionSet;
};
this.intersection = function (otherSet) {//交集
var intersectionSet = new Set();
var values = this.values();
for (var i = 0; i < values.length; i++) {
if (otherSet.has(values[i])) {
intersectionSet.add(values[i]);
}
}
return intersectionSet;
};
this.difference = function (otherSet) {//差集
var differenceSet = new Set();
var values = this.values();
for (var i = 0; i < values.length; i++) {
if (!otherSet.has(values[i])) {
differenceSet.add(values[i]);
}
}
return differenceSet;
};
this.subset = function (otherSet) {//子集
if (this.size() > otherSet.size()) {
return false;
} else {
var values = this.values();
for (var i = 0; i < values.length; i++) {
if (!otherSet.has(values[i])) {
return false;
}
}
return true;
}
};
}
var set=new Set();
set.add(4);
console.log(set.valueLegacy());
console.log(set.has(1));
console.log(set.size());
var items = {};
this.has = function (value) {
return items.hasOwnProperty(value);
};
this.add = function (value) {//添加值
if (!this.has(value)) {
items[value]=value;
return false;
}
};
this.remove = function (value) {//删除某个值
if (this.has(value)) {
delete items[value];
return true;
}
return false;
};
this.clear = function () {//清除
items = {};
};
this.size = function () {
return Object.keys(items).length;
};
this.sizeLegacy = function () {//返回集合中有多少项
var count = 0;
for (var prop in items) {
if (items.hasOwnProperty(prop)) {
++count;
}
}
return count;
};
this.valueLegacy = function () {//输出现有值
var keys = [];
for (var key in items) {
keys.push(key);
}
return keys;
};
this.getItems = function () {
return items;
};
this.union = function (otherSet) {//合并集合
var unionSet = new Set();
var values = this.values();
for (var i = 0; i < values.length; i++) {
unionSet.add(values[i]);
}
values = otherSet.values();
for (var i = 0; i < values.length; i++) {
unionSet.add(values[i]);
}
return unionSet;
};
this.intersection = function (otherSet) {//交集
var intersectionSet = new Set();
var values = this.values();
for (var i = 0; i < values.length; i++) {
if (otherSet.has(values[i])) {
intersectionSet.add(values[i]);
}
}
return intersectionSet;
};
this.difference = function (otherSet) {//差集
var differenceSet = new Set();
var values = this.values();
for (var i = 0; i < values.length; i++) {
if (!otherSet.has(values[i])) {
differenceSet.add(values[i]);
}
}
return differenceSet;
};
this.subset = function (otherSet) {//子集
if (this.size() > otherSet.size()) {
return false;
} else {
var values = this.values();
for (var i = 0; i < values.length; i++) {
if (!otherSet.has(values[i])) {
return false;
}
}
return true;
}
};
}
var set=new Set();
set.add(4);
console.log(set.valueLegacy());
console.log(set.has(1));
console.log(set.size());
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