[英]How to check if an object in an array has an empty string?
如何检查数组中的对象是否有空字符串?
var arr = [
{name: "Bob", middle_name: ""},
{name: "John", middle_name: "Denver March"}
];
我可以使用这样的东西吗:
if (arr[i].middle_name === "") {
alert("true")
}
同时还要确保如果对象不为空,它就不会说真?
是的。 这是一个例子。
var arr = [{ name: "Bob", middle_name: "" }, { name: "John", middle_name: "Denver March" }, { name: "Bill", middle_name: "Storm" }, { name: "Empty person", middle_name: "" } ]; for (var i = 0; i < arr.length; i++) { if (arr[i].middle_name === "") { alert(arr[i].name + " is empty"); } }
我会使用Array#some
来完成这项工作:
some() 方法测试数组中是否至少有一个元素通过了由提供的函数实现的测试。 它返回一个布尔值。
const check = xs => xs.some(({middle_name}) => middle_name === ""); console.log(check(arr)); //=> true console.log(check(arr2)); //=> false
<script> var arr = [ {name: "Bob", middle_name: ""}, {name: "John", middle_name: "Denver March"} ]; var arr2 = [ {name: "Bob", middle_name: "John Doe"}, {name: "John", middle_name: "Denver March"} ]; </script>
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