测试 JavaScript 数组中 JSON 值是否存在
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Test existence of JSON value in JavaScript Array
提问by thugsb
I have an array of JSON objects like so:
我有一个像这样的 JSON 对象数组：
var myArray = [
{name:'foo',number:2},
{name:'bar',number:9},
{etc.}
]
How do I detect if myArray contains an object with name="foo"?
如何检测 myArray 是否包含 name="foo" 的对象？
回答by James Montagne
Unless I'm missing something, you should use each at the very least for readability instead of map. And for performance, you should break the each once you've found what you're looking for, no reason to keep looping:
除非我遗漏了某些东西，否则您至少应该使用每个来提高可读性而不是地图。对于性能，一旦找到要查找的内容，就应该打破 each ，没有理由继续循环：
var hasFoo = false;
$.each(myArray, function(i,obj) {
if (obj.name === 'foo') { hasFoo = true; return false;}
});
回答by Marek
for(var i = 0; i < myArray.length; i++) {
if (myArray[i].name == 'foo')
alert('success!')
}
回答by Edgar Villegas Alvarado
With this:
有了这个：
$.each(myArray, function(i, obj){
if(obj.name =='foo')
alert("Index "+i + " has foo");
});
Cheers
干杯
回答by mVChr
var hasFoo = false;
$.map(myArray, function(v) {
if (v.name === 'foo') { hasFoo = true; }
});
