如何在JavaScript中删除数组中的空元素?
是否有一种简单的方法,或者我需要循环并手动删除它们?
如何在JavaScript中删除数组中的空元素?
是否有一种简单的方法,或者我需要循环并手动删除它们?
当前回答
干净的方法。
var arr = [0,1,2,"Thomas","false",false,true,null,3,4,undefined,5,"end"];
arr = arr.filter(Boolean);
// [1, 2, "Thomas", "false", true, 3, 4, 5, "end"]
其他回答
var data = [null, 1,2,3];
var r = data.filter(function(i){ return i != null; })
console.log(r)
[1,2,3]
可以使用带有索引和in运算符的筛选器
设a=[1,,2,,,3];设b=a.filter((x,i)=>a中的i);console.log({a,b});
使用正则表达式筛选出无效条目
array = array.filter(/\w/);
filter + regexp
如果有人想要清理整个阵列或对象,这可能会有所帮助。
var qwerty = {
test1: null,
test2: 'somestring',
test3: 3,
test4: {},
test5: {
foo: "bar"
},
test6: "",
test7: undefined,
test8: " ",
test9: true,
test10: [],
test11: ["77","88"],
test12: {
foo: "foo",
bar: {
foo: "q",
bar: {
foo:4,
bar:{}
}
},
bob: {}
}
}
var asdfg = [,,"", " ", "yyyy", 78, null, undefined,true, {}, {x:6}, [], [2,3,5]];
function clean_data(obj) {
for (var key in obj) {
// Delete null, undefined, "", " "
if (obj[key] === null || obj[key] === undefined || obj[key] === "" || obj[key] === " ") {
delete obj[key];
}
// Delete empty object
// Note : typeof Array is also object
if (typeof obj[key] === 'object' && Object.keys(obj[key]).length <= 0) {
delete obj[key];
}
// If non empty object call function again
if(typeof obj[key] === 'object'){
clean_data(obj[key]);
}
}
return obj;
}
var objData = clean_data(qwerty);
console.log(objData);
var arrayData = clean_data(asdfg);
console.log(arrayData);
输出:
删除任何null、undefined、“”、“”空对象或空数组
jsfiddle在这里
// recursive implementation
function compact(arr) {
const compactArray = [];
//base case
if(!arr.length) return []
if(typeof arr[0] !== "undefined"
&& arr[0]!==null && arr[0] !== " " &&
arr[0]!== false &&
arr[0]!== 0){
compactArray.push(arr[0]);
}
return compactArray.concat(compact(arr.slice(1)))
}
compact([1,0,false,null,undefined,"banana"])`