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
这个呢(ES6):从数组中删除Falsy值。
var arr = [0,1,2,"test","false",false,true,null,3,4,undefined,5,"end"];
arr.filter((v) => (!!(v)==true));
//output:
//[1, 2, "test", "false", true, 3, 4, 5, "end"]
其他回答
如果需要删除所有空值(“”、null、undefined和0):
arr = arr.filter(function(e){return e});
要删除空值和换行符,请执行以下操作:
arr = arr.filter(function(e){ return e.replace(/(\r\n|\n|\r)/gm,"")});
例子:
arr = ["hello",0,"",null,undefined,1,100," "]
arr.filter(function(e){return e});
返回:
["hello", 1, 100, " "]
更新(基于Alnitak的评论)
在某些情况下,您可能希望在数组中保留“0”并删除其他任何内容(null、undefined和“”),这是一种方法:
arr.filter(function(e){ return e === 0 || e });
返回:
["hello", 0, 1, 100, " "]
“误用”。。。在(对象成员)循环中。=>循环体中仅显示真实值。
// --- Example ----------
var field = [];
field[0] = 'One';
field[1] = 1;
field[3] = true;
field[5] = 43.68;
field[7] = 'theLastElement';
// --- Example ----------
var originalLength;
// Store the length of the array.
originalLength = field.length;
for (var i in field) {
// Attach the truthy values upon the end of the array.
field.push(field[i]);
}
// Delete the original range within the array so that
// only the new elements are preserved.
field.splice(0, originalLength);
这是另一种方法:
var arr = ["a", "b", undefined, undefined, "e", undefined, "g", undefined, "i", "", "k"]
var cleanArr = arr.join('.').split(/\.+/);
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"])`