JavaScriptでHash機能を実現する
サンプルコード
Hash = function () {
}
Hash.prototype = {
constructor: Hash,
add: function (k, v) {
if (!this.hasOwnProperty(k)) {
this[k] = v;
}
},
remove: function (k) {
if (this.hasOwnProperty(k)) {
delete this[k];
}
},
update: function (k, v) {
this[k] = v;
},
has: function (k) {
var type = typeof k;
if (type === 'string’ || type === 'number’) {
return this.hasOwnProperty(k);
} else if (type === 'function’ && this.some(k)) {
return true;
}
return false;
},
clear: function () {
for (var k in this) {
if (this.hasOwnProperty(k)) {
delete this[k];
}
}
},
empty: function () {
for (var k in this) {
if (this.hasOwnProperty(k)) {
return false;
}
}
return true;
},
each: function (fn) {
for (var k in this) {
if (this.hasOwnProperty(k)) {
fn.call(this, this[k], k, this);
}
}
},
map: function (fn) {
var hash = new Hash;
for (var k in this) {
if (this.hasOwnProperty(k)) {
hash.add(k, fn.call(this, this[k], k, this));
}
}
return hash;
},
filter: function (fn) {
var hash = new Hash;
for (var k in this) {
}
},
join: function (split) {
split = split !== undefined ? split : ',’;
var rst = [];
this.each(function (v) {
rst.push(v);
});
return rst.join(split);
},
every: function (fn) {
for (var k in this) {
if (this.hasOwnProperty(k)) {
if (!fn.call(this, this[k], k, this)) {
return false;
}
}
}
return true;
},
some: function (fn) {
for (var k in this) {
if (this.hasOwnProperty(k)) {
if (fn.call(this, this[k], k, this)) {
return true;
}
}
}
return false;
},
find: function (k) {
var type = typeof k;
if (type === 'string’ || type === 'number’ && this.has(k)) {
return this[k];
} else if (type === 'function’) {
for (var _k in this) {
if (this.hasOwnProperty(_k) && k.call(this, this[_k], _k, this)) {
return this[_k];
}
}
}
return null;
}
};