I have a single array looking like this:
var x = [[29,"Abc","9320","390"],[932,"123","9301","9032"], ...]
I'm looking to sort this array, so that it is organised by the first value of each array. In this case, that would look like this:
[[932,"123","9301","9032"], [29,"Abc","9320","390"], ...]
I've attempted to use .forEach but have been unable to get it working. Could anyone offer any suggestions?
Try this:
var x = [[29,"Abc","9320","390"], [932,"123","9301","9032"]];
var sorted = x.sort(function(a, b) {
return b[0] - a[0];
});
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort
return b[0] - a[0] would be more appropriate.The proper way to do with sort is this:
var sorted = x.sort(function(a, b) {
return a[0] - b[0];
}).reverse(); // the sort is in ascending order so we need to finally reverse the array to have your final array in descending order!
or even better:
var sorted = x.sort(function(a, b) {
return b[0] - a[0];
})
if you compare the values using a < or > it wont always work:
Sorting in JavaScript: Shouldn't returning a boolean be enough for a comparison function?
However for numbers using a '-' is fine:
