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[英]JavaScript filter through array and only return based on match of one value
[英]Filter through array to return only one value if more than one exists
我想通過一個數組進行過濾,如果存在多個城市名稱,則僅返回一個城市名稱。
例如,底部代碼的理想輸出為:
紐約
俄亥俄州
火星
----這是當前輸出----
紐約
俄亥俄州
紐約
火星
var people = [{
name: "jack",
age: 22,
city: "new york"
}, {
name: "john",
age: 35,
city: "ohio"
}, {
name: "travis",
age: 21,
city: "new york"
}, {
name: "david",
age: 42,
city: "mars"
}];
for (var i = 0; i < people.length; i++) {
console.log(people[i].city);
}
jsfiddle: http : //jsfiddle.net/q3nj6ey1/1/
如果城市不存在,請添加到新陣列中。
var cities = [];
var numPeople = people.length;
for (var i = 0; i < numPeople; i++) {
if(cities.indexOf(people[i].city) == -1){
cities.push(people[i].city);
}
}
然后,您可以根據需要打印數組:
for(var i=0;i<cities.length;i++){
console.log(cities[i]);
}
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