I have an array of objects like so:

var quantityPricing = [ 
    { quantity: 1, cost: 0.5 }, 
    { quantity: 100, cost: 0.45 }, 
    { quantity: 1000, cost: 0.25 }, 
    { quantity: 500, cost: 0.35 }
];

I am trying to sortBy the content of this array in ascending order based on the quantity, so the result I am expecting should be:

[
    { quantity: 1, cost: 0.5 },
    { quantity: 100, cost: 0.45 },
    { quantity: 500, cost: 0.35 },
    { quantity: 1000, cost: 0.25 }
]

I have therefore tried to use the lodash mand:

_.sortBy(quantityPricing, ['quantity']);

But unfortunately the result which is returned by the function seem to be only sorted by the first digit in the quantity, for example:

{
    "quantity": 1,
    "cost": 0.5
},
{
    "quantity": 100,
    "cost": 0.45
},
{
    "quantity": 1000,
    "cost": 0.25
},
{
    "quantity": 500,
    "cost": 0.35
}

I do not understand why 500 es at the end, unless it is sorting by the first digit only? As 500 should e after 100 once my array is sorted.

Any help would be greatly appreciated.

I have an array of objects like so:

var quantityPricing = [ 
    { quantity: 1, cost: 0.5 }, 
    { quantity: 100, cost: 0.45 }, 
    { quantity: 1000, cost: 0.25 }, 
    { quantity: 500, cost: 0.35 }
];

I am trying to sortBy the content of this array in ascending order based on the quantity, so the result I am expecting should be:

[
    { quantity: 1, cost: 0.5 },
    { quantity: 100, cost: 0.45 },
    { quantity: 500, cost: 0.35 },
    { quantity: 1000, cost: 0.25 }
]

I have therefore tried to use the lodash mand:

_.sortBy(quantityPricing, ['quantity']);

But unfortunately the result which is returned by the function seem to be only sorted by the first digit in the quantity, for example:

{
    "quantity": 1,
    "cost": 0.5
},
{
    "quantity": 100,
    "cost": 0.45
},
{
    "quantity": 1000,
    "cost": 0.25
},
{
    "quantity": 500,
    "cost": 0.35
}

I do not understand why 500 es at the end, unless it is sorting by the first digit only? As 500 should e after 100 once my array is sorted.

Any help would be greatly appreciated.

• javascript
• node.js
• lodash

• what if quantity will same so you expect their cost to be in ascending order ? – Mahi Commented Nov 24, 2016 at 18:32

3 Answers 3

Lodash sortBy doesn't modify the original array and it should return a new array. Are you printing the original array?

Test with this code and it works:

var arr = _.sortBy(quantityPricing, 'quantity');
console.log(arr);

Result:

[ { quantity: 1, cost: 0.5 },
  { quantity: 100, cost: 0.45 },
  { quantity: 500, cost: 0.35 },
  { quantity: 1000, cost: 0.25 } ]

Your code should actually work.

https://jsbin./vepipafaha/edit?html,js,console,output

You probably have supplied string instead of number for quantity in your JSON Array.

Your code actually does work (as pointed out by @drinchev).

1. Go to https://lodash./docs/ (which has lodash loaded as a global variable)
2. Open your browser's Javascript console.

3. Paste this code and hit return:

   _.sortBy([
     { quantity: 1, cost: 0.5 }, 
     { quantity: 100, cost: 0.45 }, 
     { quantity: 1000, cost: 0.25 }, 
     { quantity: 500, cost: 0.35 }
   ], ['quantity']);
   

It will look like this: