If I have an JavaScript array:
a = ["12", "34", "56", "78"];
and I want to make a new 2D array like this:
b = [ ["12345678"], ["34567812"], ["56781234"], ["78123456"] ];
I know this should be pretty simple but I just can't figure it out... My brain is kinda slow today... :/
Join the string at various pivot locations.
n = [];
for(i = 0; i < a.length; i++){
n.push(a.slice(i).join("") + a.slice(0,i).join(""));
}
This outputs:
[ "12345678", "34567812", "56781234", "78123456" ]
I am not certain whether having nested single element arrays in the output was a mistake, but if that is required just add square brackets inside push.
You can use map in conjunction with concat like this:
var newA = a.map(function() {
var copy = a.slice();
return [copy.concat(copy.splice(0, arguments[1])).join('')];
});
// => [ ["12345678"], ["34567812"], ["56781234"], ["78123456"] ];
