I have an array called mainarray which has multiple json objects.
mainarray:Object
>key1: Array[30]
>key2: Array[20]
I want to do sorting on Array[30] and Array[20]. I am trying to do it like this:
mainarray.forEach((arrayinner)
{
//sort
});
But I am getting error : as Cannot read property of undefined.
How can I iterate ? and also key names are dynamic ,I cant hardcode it and start iterating/
You need the function keyword for a valid callback declaration.
mainarray.forEach(function (arrayinner)
// ^^^^^^^^
{
//sort
});
But the problem is deeper:
You need to get the keys and to iterate over them and take the propery value to apply a sort
Object.keys(mainarray).forEach(function (key) {
mainarray[key].sort();
});
You can get the array of keys to iterate over
Object.keys ( mainarray ).forEach( function( arrayinner ){
arrayinner.sort();
});
if the all the keys inside mainarray may not have Array value, then you can check before sorting
Object.keys ( mainarray ).forEach( function( arrayinner ){
Array.isArray( arrayinner ) || arrayinner.sort();
});
You can do it by using $.each
$.each(mainarray, function(key,val){
val.sort((a,b) => {return a > b ? 1 : a < b ? -1 : 0});
});
since the val is an array aka an object. Its reference will be shared inside of the callBack function. So affecting that array inside callBack will affect the original array.
You could achieve this by looping over the properties of the object itself and sorting the arrays they contain, something like this:
for (var key in mainarray) {
if (mainarray[key] === Array)
mainarray[key].sort();
}
Note that by default sort() only uses basic alphanumeric sorting logic. If you need anything more complex you would need to implement that yourself.
mainarray.forEach((arrayinner) => { // sort })in fact for a single argument you don't even need the parentheses and do likemainarray.forEach(arrayinner => { // sort })and then the idea behind inline arrows is to cut the code short. So no point in using long variable names and you can reduce your code more likemainarray.forEach(a => { // sort })