Apologies for this embarassingly simple question but I'm still relatively new to javascript.
I have an array of names, something like
var myArray = ['Hill M','Zhang F','Dong L', 'Wilkinson JS', 'Harris N'];
I would like to return a string, with names separated by commas, but with "and" between the final two names, i.e.
'Hill M, Zhang F, Dong L, Wilkinson JS and Harris开发者_Go百科 N'
What is the most efficient way to do this in javascript?
How about if I wanted to transpose the names and initials, i.e. to return
'M Hill, F Zhang, L Dong, JS Wilkinson and N Harris'
Array::slice() Selects a part of an array, and returns the new array.
Array::join() Joins all elements of an array into a string
String::concat() Concatenates two or more strings.
var myArray = ['Hill M','Zhang F','Dong L', 'Wilkinson JS', 'Harris N'];
console.log(myArray.slice(0, myArray.length - 1).join(', ').concat(
' and ' + myArray[myArray.length - 1]));
//Hill M, Zhang F, Dong L, Wilkinson JS and Harris N
To change their order:
var myArray = ['Hill M','Zhang F','Dong L', 'Wilkinson JS', 'Harris N'];
for(var i = 0; i < myArray.length; i++)
myArray[i] = myArray[i].replace(/^(\S+)\s+(.+)$/, '$2 $1');
console.log(myArray.slice(0, myArray.length - 1).join(', ').concat(
' and ' + myArray[myArray.length - 1]));
//M Hill, F Zhang, L Dong, JS Wilkinson and N Harris
In case you are wondering about str.replace(/^(\S+)\s+(.+)$/, '$2 $1');
/^(\S+)\s+(.+)$/
is regular expression that matches a string that:
^ #starts with
\S+ #one or more non whitespace characters, followed by
\s+ #one or more whitespace characters, followed by
.+ #one or more characters
$1
and $2
in the replacement string stands for 1st and 2nd groups (subpatterns enclosed in parentheses) from the regex.
Use join for combining the values in the array.
var myJoinedString = myArray.join(',');
var myArray = ['Hill M','Zhang F','Dong L', 'Wilkinson JS', 'Harris N'];
var replaced = myArray.map(function(elem) {
return elem.replace(/(\S+)\s+(\S+)/, "$2 $1");
});
var last = replaced.pop()
var result = replaced.join(", ") + " and " + last;
alert(result)
Try this:
if (myArray.length <= 1) {
str = myArray.join();
} else {
str = myArray.slice(0, -1).join(", ") + " and " + myArray[myArray.length-1];
}
And for your swapping part:
myArray.map(function(val) { return val.split(" ").reverse().join(" "); })
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