[英]iterate over array of objects using map
I want to iterate over an array of objects and pass wach object to a new array. 我想遍历对象数组并将wach对象传递给新数组。
But the result is always the last object. 但是结果始终是最后一个对象。
obj = [{ text: 'a'},{ text: 'b'}];
obj.map(funktion(item){
result.push(Ext.merge({xtype: 'button'}, item));
});
// result is twice with text:'b'
It's always the last item. 它始终是最后一项。 How dies this work? 这项工作如何消亡?
Ext.merge simply merges two objects, same as JavaScript merge. Ext.merge简单地合并两个对象,与JavaScript合并相同。
EDIT 1: so I changed to 编辑1:所以我改为
obj = [{ text: 'a'},{ text: 'b'}];
btnsDest = obj.map(function(item){
return Ext.merge({xtype: 'button'}, item);
});
Still the same. 还是一样。 btnsDest[i].text is always 'b' btnsDest [i] .text始终为“ b”
EDIT 2: so I actually had the following and tagt did not work 编辑2:所以我实际上有以下内容,但tagt不起作用
button = { xtype: 'button'};
obj = [{ text: 'a'},{ text: 'b'}];
btnsDest = obj.map(function(item){
return Ext.merge(button, item);
});
So adding the var button to the callback did the trick. 因此,将var按钮添加到回调中就可以了。
Within the map
's callback function you need to return the transformed value ( mapped
): 在map
的回调函数中,您需要返回转换后的值(已mapped
):
obj = [{ text: 'a'},{ text: 'b'}];
obj.map(function(item){
return Ext.merge({xtype: 'button'}, item);
});
Following is what I tried at my end with node
and it works: 以下是我在node
末尾尝试过的方法,它有效:
function merge_options(obj1,obj2){
var obj3 = {};
for (var attrname in obj1) { obj3[attrname] = obj1[attrname]; }
for (var attrname in obj2) { obj3[attrname] = obj2[attrname]; }
return obj3;
}
button = { xtype: 'button'};
obj = [{ text: 'a'},{ text: 'b'}];
btnsDest = obj.map(function(item){
return merge_options(button, item);
});
console.log(JSON.stringify(btnsDest));
Output is: 输出为:
[{"xtype":"button","text":"a"},{"xtype":"button","text":"b"}]
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