问题描述
我有十个阵列,空值
onTable [0-10]。
看
[Jean5,Jean3,Paul2,Jean6,,Paul4,让,peirre4,]
[Paul5,peirre6,peirre3,,Jean4,保,peirre5,Jean2,]
...
我希望得到每个数组的长度,不为空值,没有创造10个变量进行检查。
我有测试此解决方案
在阵列 ,但不是我想要的。
如果可能的话,我想这个样子
onTable [0]。长度(不包括())
有什么好办法的作出这样的?
使用过滤器
与布尔
过滤非-empty元素从它子数组,并使用长度
。
onTable [0] .filter(布尔)。长度
由于空字符串是在JavaScript中falsy,它会从过滤阵列中删除。
演示:
VAR ARR = [\r
[Jean5,Jean3,Paul2,Jean6,,Paul4,让,peirre4,],\r
[Paul5,peirre6,peirre3,,Jean4,保,peirre5,Jean2,]\r
];\r
\r
变种LEN =改编[1] .filter(布尔型)。长度;\r
文件撰写(LEN);
\r
I have ten arrays with empty value
onTable[0 to 10];
look
["Jean5", "Jean3", "Paul2", "Jean6", "", "Paul4", "Jean", "peirre4", ""]
["Paul5", "peirre6", "peirre3", "", "Jean4", "Paul", "peirre5", "Jean2", ""]
...
I want get length of each array without empty value and without create ten variables for check that.
I have test this solutioncount empty values in array but i dont want make ten variable. ie: count1, count2,...
.
I check too compare two arrays based on length: skip empty values but is not what i want.
If possible, I want this look like
onTable[0].length(exclude(""))
What is the good way for make that?
Use filter
with Boolean
to filter non-empty elements from sub-array and use length
on it.
onTable[0].filter(Boolean).length
As empty string is falsy in JavaScript, it'll be removed from filtered array.
Demo:
var arr = [
["Jean5", "Jean3", "Paul2", "Jean6", "", "Paul4", "Jean", "peirre4", ""],
["Paul5", "peirre6", "peirre3", "", "Jean4", "Paul", "peirre5", "Jean2", ""]
];
var len = arr[1].filter(Boolean).length;
document.write(len);
这篇关于得到嵌套数组非空元素的数量的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!