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List.js
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List.js
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/**
* @Author: zhuxiankang
* @Date: 2018-09-26 08:59:27
* @Desc: 列表
*/
/*
列表在日常生活中经常被使用,例如待办事项列表、购物清单、榜单等。列表适合用于保存的元素不是很多的时候。
当不需要在一个很长的序列中查找元素,或者对齐进行排序时,列表非常有用,当然如果数据结构非常复杂,列表作用就不大了。
*/
function List() {
this.listSize = 0
this.listPos = 0
this.list = []
}
List.prototype.append = function(list) {
this.list[this.listSize ++] = list
}
List.prototype.find = function(list) {
for(var i=0; i<this.list.length; i++) {
if(this.list[i] === list) {
return i
}
}
return -1
}
List.prototype.remove = function(list) {
var foundAt = this.find(list)
if(foundAt > -1) {
this.list.splice(foundAt, 1)
-- this.listSize
return true
}
return false
}
List.prototype.length = function() {
return this.listSize
}
List.prototype.toString = function() {
return this.list.join(',')
}
List.prototype.insertBefore = function(list, after) {
var insertAt = this.find(after)
if(insertAt > -1) {
this.list.splice(insertAt, 0, list)
++ this.listSize
return true
}
return false
}
List.prototype.insertAfter = function(list, before) {
var insertAt = this.find(before)
if(insertAt > -1) {
this.list.splice(insertAt + 1, 0, list)
++ this.listSize
return true
}
return false
}
List.prototype.clear = function() {
delete this.list
this.list = []
this.listSize = this.listPos = 0
}
List.prototype.contains = function(list) {
for(var i=0; i<this.list.length; i++) {
if(this.list[i] === list) {
return true
}
}
return false
}
List.prototype.front = function() {
this.listPos = 0
}
List.prototype.end = function() {
this.listPos = this.listSize - 1
}
List.prototype.prev = function() {
if(this.listPos > 0) {
-- this.listPos
}
}
List.prototype.next = function() {
if(this.listPos < this.listSize - 1) {
++ this.listPos
}
}
List.prototype.currPos = function() {
return this.listPos
}
List.prototype.moveTo = function(pos) {
this.listPos = pos
}
List.prototype.getList = function() {
return this.list[this.listPos]
}
let list = new List()
list.append('ziyi2')
list.append('ziyi3')
console.log(list)
console.log(list.find('ziyi2'))
console.log(list.toString())
console.log(list.length())
list.insertBefore('ziyi1', 'ziyi2')
list.insertBefore('ziyi23', 'ziyi3')
console.log(list.toString())
list.insertAfter('ziyi4', 'ziyi3')
console.log(list.toString())
list.insertAfter('ziyi223', 'ziyi2')
console.log(list.toString())
list.clear()
console.log(list.length())
console.log(list.contains('ziyi2'))
list.append('ziyi1')
console.log(list.contains('ziyi1'))
list.append('ziyi2')
list.append('ziyi3')
list.append('ziyi4')
list.front()
console.log(list.getList())
list.end()
console.log(list.getList())
list.prev()
console.log(list.getList())
console.log(list.length())
console.log(list.toString())
for(list.front(); list.currPos() < list.length() - 1; list.next()) {
console.log(list.currPos())
console.log(list.getList())
}