Javascript: Sort arrays based on each array's length number

Question

How can I sort these arrays (from array with most amount of items inside to least)? I think the logic is there but there are methods I am missing. Output shows nothing.

//Declare Variables
var TN = ['Chattanooga', 'Nashville', 'Memphis'],
    FL = ['Tampa', 'Miami', 'Orlando', 'Clearwater'],
    GA = ['Atlanta', 'Marietta'];



//write function to sort array from most to least
function sortStates(a, b){
    return a - b;
}


//Make an object to get total in each array. 
var stateTotal = {
        totalTN: TN.length,
        totalFL: FL.length,
        totalGA: GA.length
};

//Sort states in order
stateTotal.sort(sortStates);

console.log(stateTotal);

Desired Output: totalFL: 4, totalTN: 3, totalGA: 2

You are doing sort directly on object. i think sort takes an array like array.sort() — M A Salman
– M A Salman, Commented Mar 14, 2020 at 17:36
@Stratubas sorry- I've included it at the bottom. I want it to sort the arrays in most to least amount of values in each one. — melonbutter
– melonbutter, Commented Mar 14, 2020 at 17:41

Stratubas · Accepted Answer · 2020-03-14 17:57:38Z

1

Stuff inside objects can't be "sorted". Stuff in arrays can be sorted.

Is this some kind of exercise? Make an object to get total in each array. is vague.

Anyway, take a look at this snippet.

//Declare Variables
var TN = ['Chattanooga', 'Nashville', 'Memphis'],
    FL = ['Tampa', 'Miami', 'Orlando', 'Clearwater'],
    GA = ['Atlanta', 'Marietta'];

//write function to sort array from most to least
function sortStates(a, b) {
    return b.total - a.total;
}

//Make an object to get total in each array. 
var stateTotal = [
    { name: 'totalTN', total: TN.length },
    { name: 'totalFL', total: FL.length },
    { name: 'totalGA', total: GA.length }
];

//Sort states in order
stateTotal.sort(sortStates);

stateTotal.forEach(info => {
  console.log(`${info.name}: ${info.total}`);
});

answered Mar 14, 2020 at 17:57

Stratubas

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1 Comment

melonbutter Over a year ago

perfect! I was missing the foreach part. Didn't even think about it.

M A Salman · Accepted Answer · 2020-03-14 17:58:24Z

0

Best way to do the sort on length of states is

var states=[];
states.push({
    name:"TN",
    towns:['Chattanooga', 'Nashville', 'Memphis']
    });
states.push({
    name:"FL",
    towns:['Tampa', 'Miami', 'Orlando', 'Clearwater']
    });
states.push({
    name:"GA",
    towns:['Atlanta', 'Marietta']
});
states.sort((state1,state2) => state2.towns.length - state1.towns.length).forEach( state => console.log(`total${state.name}:${state.towns.length}`));

answered Mar 14, 2020 at 17:58

M A Salman

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Comments

DCR · Accepted Answer · 2020-03-14 18:36:42Z

0

Working with objects and arrays can be confusing. Arrays->[] may be sorted. Object properties are not sorted.

//Declare Variables
var myData = {TN:['Chattanooga', 'Nashville', 'Memphis'],
              FL:['Tampa', 'Miami', 'Orlando', 'Clearwater'],
              GA:['Atlanta', 'Marietta']};

var keys=Object.keys(myData);

var mySort=[];
for(key in keys){
   mySort.push([keys[key],myData[keys[key]].length]);
}

mySort.sort(function(a, b){
    return b[1] - a[1];
});

myObj={};

for(let i=0;i<mySort.length;i++){

myObj["total" + mySort[i][0]] = mySort[i][1]

}

console.log(myObj);

edited Mar 14, 2020 at 18:36

answered Mar 14, 2020 at 18:24

DCR

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