In Javascript,
hello += ' world'
// is shorthand for
hello = hello + ' world'
Is there a shorthand operator for the opposite direction?
hello = ' world' + hello
I tried hello =+ ' world' but it did not work: it just typecast ' world' into NaN and then assigned it to hello.
Is there a shorthand operator for the opposite direction?
No, all JavaScript compound assignment operators take the target as the left-hand operand.
Just use the hello = ' world' + hello; statement that you had. If you're doing this repetively, consider using an array as a buffer to which you can prepend by the unshift method.
There is not really a shorthand for what you are describing.
An alternative approach would be to use String's concat function:
var hello = 'hello';
var reverse = 'world '.concat(hello);
String title = title.concat("-"+title); Thank you.Javascript doesn't have 'reverse' operator for strings, but there is Array.reverse() function which can help you in such cases:
var hello = "hello";
hello = (hello + ",world, beautiful").split(",").reverse().join(' ');
console.log(hello); // beautiful world hello
Concat returns the array without modifying existing arrays so where as you have
a= a.concat(b) // to put b at the end of a
You could just as easily do a = b.concat(a)? // put b followed by a. IE b at the beginning of the list a
" world" += hello;, works but you need to capture the output.