Remove same value in a array

[Balaji Murugesan]

var indexArray = ["Apple", "Banana","Cherry","Apple","Banana","Dates"]

var uniquValues = unique(indexArray);

alert(uniquValues);

function unique(array) {
var o = {};
r = [];
for (i = 0; i < array.length; i++) {
o[array[i]] = array[i];
}
for (i in o) {
r.push(o[i]);
}
return r;
};

Hi team,

The output of the above coding is shown in below:

Output : Apple, Banana, Cherry, Dates

But i need to remove same values in indexArray and show output like as below:

Output: Cherry, Dates

please anyone give me suggestions.

[Manan Joshi]

Try the following

var indexArray = ["Apple", "Banana","Cherry","Apple","Banana","Dates"]

var uniquValues = unique(indexArray);

alert(uniquValues);

function unique(array) {
	var o = {};
	r = [];
	for (i = 0; i < array.length; i++) {
		if(o[array[i]])
			delete o[array[i]]
		else
			o[array[i]] = array[i];
	}
	for (i in o) {
		r.push(o[i]);
	}
	return r;
};

-Manan

[Balaji Murugesan]

Hi Manan,

Superrrrrrr.

But,

Try this index value:
var indexArray = ["Apple", "Banana","Cherry","Apple","Banana","Dates","Apple"];

The index value must be removed, its available n numbers are OK but must be removed.

Thanks

[Manan Joshi]

I completely lost it, please explain again. I checked with the new value that you sent and the returned array has values Cherry, Dates, Apple which looks correct. What is the issue?

-Manan

[Balaji Murugesan]

Hi Manan,

The Duplicate values need to remove, 

Output of your lines is: Cherry, Dates, Apple

but expected output is: Cherry, Dates

apple is duplicate value and beed to remove it come 2 or and above.

Thanks

Balaji 

[Manan Joshi]

Try the following

var indexArray = ["Apple", "Banana","Cherry","Apple","Banana","Dates"]

var uniquValues = unique(indexArray);

alert(uniquValues);

function unique(array) {
	var o = {};
	r = [];
	var d = []
	for (i = 0; i < array.length; i++) {
		if(o[array[i]])
		{
			d.push(o[array[i]])
			delete (o[array[i]])
		}
		else if(!d[array[i]])
			o[array[i]] = array[i];
	}
	for (i in o) {
		r.push(o[i]);
	}
	return r;
};

-Manan

[Balaji Murugesan]

Hi Manan,

Thanks for support, 

but still output shows: Cherry, Dates, Apple

Please ensure your lines.

Thanks

Balaji

[Manan Joshi]

Works for me just fine, see the screengrab of the same code executing on my machine

https://www.dropbox.com/s/t21op4f1srdlq9i/screen%20recording%202020-11-06%20at%206.50.02%20pm.mov?dl...

-Manan

[Balaji Murugesan]

Hi Manam,

Please use the following index value:

var indexArray = ["Apple", "Banana","Cherry","Apple","Banana","Dates","Apple","Banana","Graphes"]

Apple, Banana are repeated values. so need to remove those in the array

required output: Cherry, Dates and Graphes

Glad for your response every time.

Thanks

[Manan Joshi · Accepted solution]

Apologies, the variable d should have been an object, but I wrote it as an array. Try the following, it should work fine now hopefully. This code can be made more concise and more understandable, I am hopeful you would do that once it works for your use cases.

var indexArray =["Apple", "Banana","Cherry","Apple","Banana","Dates","Apple","Banana","Graphes"]
//var indexArray = ["Apple", "Banana","Cherry","Apple","Banana","Dates"]

var uniquValues = unique(indexArray);

alert(uniquValues);

function unique(array) {
	var o = {};
	r = [];
	var d = {}
	for (i = 0; i < array.length; i++) {
		if(o[array[i]])
		{
			d[o[array[i]]] = 1
			delete (o[array[i]])
		}
		else if(!d[array[i]])
			o[array[i]] = array[i];
	}
	for (i in o) {
		r.push(o[i]);
	}
	return r;
};

-Manan

[Balaji Murugesan]

Awesome Manan,

Thanks a lot, the lines working fine.

Thanks

Balaji

[Marc Autret]

function keepUniques(/*str[]*/a,  r,c,s,i,k)
{
    for( r=a.slice(), c='\x01', s=c+a.join(c)+c, i=a.length ; i-- ;
        k=c+a[i]+c, (s.indexOf(k)==s.lastIndexOf(k) || r.splice(i,1))
       );
    return r;
}

var arr = ["Apple", "Banana", "Cherry", "Apple", "Banana", "Dates", "Apple"];
alert( keepUniques(arr) ); // => Cherry,Dates

[Manan Joshi]

Hi @Marc Autret,

Few questions about your coding style.

• Thought process about making the local variables as functions params.
• You variable naming choice. I have been following some of your code snippets and see that you mostly work with single-character variable names. Is it for obfuscating the code shared on the public platforms? If not, then how do you track what does a variable hold in big functions.
• Your code is surely not the easiest to read and understand, at first sight, is the style deliberate again for obfuscation, or has it been cultivated over the years. What would you say is the benefit of this style if this is not obfuscation at play.

I would wait to read your insights. Thanks for sharing your excellent knowledge with all of us.

-Manan

[Marc Autret]

Hi @Manan Joshi

No, the purpose is not obfuscating, just sharing ideas and small routines in the most compact way. That's indeed a coding style I've cultivated over the years. Of course I still use semantic variable names in big functions, but they no longer make sense (to me) in generic algorithms. I exposed my thought process on this topic here:

Why I Do Not Use Meaningful Variable Names (Anymore) 

Best,

Marc

[Manan Joshi]

That's quite a new way to look at things. Once I read the blog, it does not feel so out of place anymore. Infact, I feel inclined to experiment with it and see how it looks and feels. Of course, when working in a team I suspect everyone would like this thought and people would have a hard time understanding the code written by someone this way when they don't subscribe to this thought process. Thanks for sharing, I learn so much reading your posts, do write more often.

-Manan