Javascript 使用下划线检查对象数组是否具有键值
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Check if an array of objects have a key value using underscore
提问by underscore666
How can check if an array of objects have a key value using underscore.
如何使用下划线检查对象数组是否具有键值。
Example:
例子：
var objects = [
{id:1, name:'foo'},
{id:2, name:'bar'}
]
check(objects, {name: foo}) // true
I think it should be made using map:
我认为应该使用地图制作它：
_.map(objects, function(num, key){ console.log(num.name) });
采纳答案by Marcin
Use findhttp://underscorejs.org/#find
使用findhttp://underscorejs.org/#find
var check = function (thelist, props) {
var pnames = _.keys(props);
return _.find(thelist, function (obj) {
return _.all(pnames, function (pname) {
return obj[pname] == props[pname];
});
});
};
回答by Florian Margaine
You can use somefor this.
您可以some为此使用。
check = objects.some( function( el ) {
return el.name === 'foo';
} );
checkis trueif the function returned trueonce, otherwise it's false.
check是true如果该函数返回true一次，否则它false。
Not supported in IE7/8 however. You can see the MDN link for a shim.
但是在 IE7/8 中不受支持。您可以查看 shim 的 MDN 链接。
For the underscore library, it looks like it's implemented too (it's an alias of any). Example:
对于下划线库，它看起来也已实现（它是 的别名any）。例子：
check = _.some( objects, function( el ) {
return el.name === 'foo';
} );
