commonJS — 数组操作（for Array）

for Array

代码

/**
* Created by laixiangran on 2016/1/24
* homepage：http://www.cnblogs.com/laixiangran/
* for Array
*/

(function(undefined) {

var com = window.COM = window.COM || {};

com.$A = (function() {
var ret = {
isArray: function(obj) {
if (Array.isArray) {
return Array.isArray(obj);
} else {
return Object.prototype.toString.call(obj) === "[object Array]";
}
},
indexOf: function(array, item, from) {
if (array.indexOf) {
return isNaN(from) ? array.indexOf(item) : array.indexOf(item, from);
} else {
var len = array.length;
from = isNaN(from) ? 0 :
from < 0 ? Math.ceil(from) + len : Math.floor(from);
for (; from < len; from++ ) {
if ( array[from] === item ) {
return from;
}
}
return -1;
}
},
lastIndexOf: function(array, item, from) {
if (array.lastIndexOf) {
return isNaN(from) ? array.lastIndexOf(item) : array.lastIndexOf(item, from);
} else {
var len = array.length;
from = isNaN(from) || from >= len - 1 ? len - 1 :
from < 0 ? Math.ceil(from) + len : Math.floor(from);
for (; from > -1; from-- ) {
if ( array[from] === item ) {
return from;
}
}
return -1;
}
}
};

function each(object, callback) {
if (undefined === object.length) {
for (var name in object) {
if (object.hasOwnProperty(name)) {
if (false === callback(object[name], name, object)) {
break;
}
}
}
} else {
for (var i = 0, len = object.length; i < len; i++) {
if (i in object) {
if (false === callback(object[i], i, object)) {
break;
}
}
}
}
}

each({
forEach: function(object, callback, thisp) {
each(object, function() {
callback.apply(thisp, arguments);
});
},
map: function(object, callback, thisp) {
var arr = [];
each(object, function() {
arr.push(callback.apply(thisp, arguments));
});
return arr;
},
filter: function(object, callback, thisp) {
var arr = [];
each(object, function(item) {
callback.apply(thisp, arguments) && arr.push(item);
});
return arr;
},
every: function(object, callback, thisp) {
var flag = true;
each(object, function() {
if (!callback.apply(thisp, arguments)) {
flag = false;
return false;
}
});
return flag;
},
some: function(object, callback, thisp) {
var flag = false;
each(object, function() {
if (callback.apply(thisp, arguments)) {
flag = true;
return false;
}
});
return flag;
}
}, function(method, name) {
ret[name] = function(object, callback, thisp) {
if (object[name]) {
return object[name](callback, thisp);
} else {
return method(object, callback, thisp);
}
}
});

return ret;
}());
}());

参考