I have a array of strings:
str[1]='apple';
str[2]='orange';
str[3]='banana';
//...many of these items
Then, I would like to construct a string variable which looks like var mystr='apple,orange,banana,...', I tried the following way:
var mystr='';
for(var i=0; i<str.length; i++){
mystr=mystr+","+str[i];
}
Which is of course not what I want, is there any efficient way to connect all this str[i] with comma?
just use the built-in join function.
str.join(',');
Check out join function
var str = [];
str[0]='apple';
str[1]='orange';
str[2]='banana';
console.log(str.join(','));
would output:
apple,orange,banana
The fastest and recommended way of doing this is with array methods:
var str = [];
str[1] = 'apple';
str[2] = 'orange';
str[3] = 'banana';
var myNewString = str.join(',');
There have been various performance tests showing that for building strings, using the array join method is far more performant than using normal string concatenation.
You need this
var mystr = str.join(',');
how about 'join()'? e.g.
var newstr = str.join();
You're looking for array.join i believe.
alert(['apple','orange','pear'].join(','));
Is this what you want?
var str = new Array(); //changed from new Array to make Eli happier
str[1]='apple';
str[2]='orange';
str[3]='banana';
var mystr=str[1];
for(var i=2; i<str.length; i++){
mystr=mystr+","+str[i];
}
console.log(mystr);
would produce
apple,orange,banana
var str = new Array; <-- what is wrong with this statement?