如何通过Node Js分割字符串？

Question

My array:

var str=['data1,data2 '];

I have used:

var arr = str.split(",");

But one error is showed. TypeError: Object data1,data2 has no method 'split'. How can I solve this problem.

My output will be:

arr= data1,data2
// or
arr[0]=data1;
arr[1]=data2;

How can I solve this problem ?

Answer 1

You should do this :

var arr = str.toString().split(",");

" TypeError: Object data1,data2 has no method 'split' " indicates the variable is not considered as a string. Therefore, you must typecast it.

---

^{update 08.10.2015} I have noticed someone think the above answer is a " dirty workaround " and surprisingly this comment is upvoted. In fact it is the exact opposite - using str[0].split(",") as 3 (!) other suggests is the real "dirty workaround". Why? Consider what would happen in these cases :

var str = [];
var str = ['data1,data2','data3,data4'];
var str = [someVariable]; 

str[0].split(",") will fail utterly as soon str holds an empty array, for some reason not is holding a String.prototype or will give an unsatisfactory result if str holds more than one string. Using str[0].split(",") blindly trusting that str always will hold 1 string exactly and never something else is bad practice. toString() is supported by numbers, arrays, objects, booleans, dates and even functions; str[0].split() has a huge potential of raising errors and stop further execution in the scope, and by that crashing the entire application.

If you really, really want to use str[0].split() then at least do some minimal type checking :

var arr;
if (typeof str[0] == 'string') {
    arr = str[0].split(',')
} else {
    arr = [];
}

Answer 2

If your starting point is a array with a string inside. This should work:

var arr = str[0].split(",");

Otherwise you should have a string as starting point for your code to work as you expected:

var str = 'data1,data2';

If you have more elements in the array you will need to iterate them with a for loop.

Edit to add other cases:

If you have several strings in that array, then you should be more carefull and do something like this:

 var str = ['data1,data2 ', ' data3, data4 ']; // notice these strings have many spaces in different places var longString = str.join(','); var array = longString.split(',').map(s => s.trim()).filter(Boolean); // removing spaces from start and end of strings, and eventually removing empty positions console.log(array); 

Answer 3

As you said, str is an array (with one element). If you want to split the string contained in the array, you have to access the array first:

var arr = str[0].split(",");

Answer 4

let's say we have two date :

date1: 17/01/1989

date2: 20/02/2000

if we want to compare them just split the string and compare like this

var date1= date1.toString().split("/");

var date2= date2.toString().split("/");

var a = parseInt(date1[2] + date1[1] + date1[0]);

var b = parseInt(date2[2] + date2[1] + date2[0]);

if(a < b){

alert("date2 bigger than date1")}

} else if(a > b){

alert("date1 bigger than date2")

} else{

alert("date 1 and date2 are equals ");

}