Check the array for the same elements

Question

I have an array:

var objects = [
    {product:'123', options:{cap:'', fort:'', count:1}},
    {product:'123', options:{cap:'', fort:'', count:1}},
    {product:'12', options:{cap:'', fort:'', count:1}},
    {product:'1234', options:{cap:'123', fort:'', count:1}},
    {product:'1234', options:{cap:'', fort:'', count:1}}
];

I need to filter this array in this way:

(product === product && options !== options) || (product !== product && options == options)

It means that the array should looks like:

var objects = [
    {product:'123', options:{cap:'', fort:'', count:1}},
    {product:'1234', options:{cap:'123', fort:'', count:1}},
    {product:'12', options:{cap:'', fort:'', count:1}},
    {product:'1234', options:{cap:'', fort:'', count:1}}
];

You don't need lodash, you basically have everything you need already https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter — Robbie Milejczak, Nov 14 '17 at 14:05
If it's a duplicate do you want the count to increment or just get rid of the duplicate? — Matt, Nov 14 '17 at 14:08
@charlietfl suing because hot coffee is hot is pretty clear too but it happens. More so when you are just using copy and paste. So I don't think it's too far off of a question. — Matt, Nov 14 '17 at 14:11
Can you explain the way you want to filter with your own words? The provided condition makes no sense. — M0nst3R, Nov 14 '17 at 14:12
This will help: https://stackoverflow.com/questions/1068834/object-comparison-in-javascript — Rajesh, Nov 14 '17 at 14:15
if options are equal to each other and products are not equal - its good if options are equal and products are equal too - bad don't pass — Valerii Monakhov, Nov 14 '17 at 14:19

gurvinder372 · Answer 1 · 2017-11-14T14:16:33.047

0

Try this (not so efficient but simple) approach

objects.map((s)=> JSON.stringify(s)).filter( (s,i,a)=> a.indexOf(s,i+1) == -1 ).map((s)=> JSON.parse(s));

Demo

var objects = [
{product:'123', options:{cap:'', fort:'', count:1}},
{product:'123', options:{cap:'', fort:'', count:1}},
{product:'12', options:{cap:'', fort:'', count:1}},
{product:'1234', options:{cap:'123', fort:'', count:1}},
{product:'1234', options:{cap:'', fort:'', count:1}}
];

objects = objects.map((s)=> JSON.stringify(s)).filter( (s,i,a)=> a.indexOf(s,i+1) == -1 ).map((s)=> JSON.parse(s));

console.log( objects );

Explanation

Convert all items to their string version using JSON.stringify
Remove duplicates
Parse them back to Objects

Note This answer won't work if your objects' keys are not in same order and any function values in the object will be removed after stringify and parse.

edited Nov 14 '17 at 14:16

answered Nov 14 '17 at 14:10

gurvinder372

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1

Note, JSON.stringify + JSON.parse will remove any function in object – Rajesh Nov 14 '17 at 14:12
1

Be careful using this approach. If object keys are in different order won't compare properly when stringified – charlietfl Nov 14 '17 at 14:13
Yes, agree to both the comments above. – gurvinder372 Nov 14 '17 at 14:16
Unfortunately, they are in different order I receive an array from client side then concat it with array from db and then I need to filter result – Valerii Monakhov Nov 14 '17 at 14:33
@ValeriiMonakhov In that case use deepCompare from https://stackoverflow.com/a/1144249/1984039 for comparison instead of its stringified version. – gurvinder372 Nov 14 '17 at 14:34

Check the array for the same elements

1 Answers1