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完成作业-徐政起-homework1 #239

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4082184
完成作业
xzq8 Mar 23, 2019
27eccd3
完成作业
xzq8 Mar 23, 2019
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21 changes: 20 additions & 1 deletion js/list.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@ function List(head, tail) {

// Returns a new List containing the array.
List.list = function (array) {
var sentinel = new List(),
var sentinel = new List(), //
len = array.length,
p, i;

Expand All @@ -19,9 +19,27 @@ List.list = function (array) {
p.tail = new List(array[i]);
p = p.tail;
}
// console.log(sentinel.tail);
return sentinel.tail;
}

List.prototype.forEach = function(cb){
var L,i;
for (L = this,i=0; L !== null; L = L.tail,i++) {
cb(L.head,i)
}
}

List.prototype.push = function(item){
var L = this;
while(L.tail)
{
L = L.tail
}
L.tail = new List(item);
return this
}

// Returns a readable String for THIS.
List.prototype.toString = function () {
var res = '', L;
Expand All @@ -32,3 +50,4 @@ List.prototype.toString = function () {
res += ' ]';
return res;
};

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