如何从ionic 2中的数组中过滤json数据

Question

I am a beginner in Ionic 2. I have successfully fetch data from URL into an array.In my json response, there are multiple duplicate values. I have filter json response by using lodash command. But I am not getting a proper result which I required.Please give me solution for this.

This is my json response:

 {
            "port_group": "Bandra Group Of Ports",
            "port_name": "Dahanu"
        },
        {
            "port_group": "Bandra Group Of Ports",
            "port_name": "Tarapur"
        },
        {
            "port_group": "Bandra Group Of Ports",
            "port_name": "Navapur"
        },
        {
            "port_group": "Bandra Group Of Ports",
            "port_name": "Satpati"
        },
        {
            "port_group": "Bandra Group Of Ports",
            "port_name": "Kelwa mahim"
        },
        {
            "port_group": "Bandra Group Of Ports",
            "port_name": "Arnala"
        },
        {
            "port_group": "Bandra Group Of Ports",
            "port_name": "Uttan"
        },
        {
            "port_group": "Bandra Group Of Ports",
            "port_name": "Versova"
        },
        {
            "port_group": "Bandra Group Of Ports",
            "port_name": "Marve-Manori"
        },
        {
            "port_group": "Bandra Group Of Ports",
            "port_name": "Bandra"
        },
        {
            "port_group": "Mora Group Port",
            "port_name": "Trombay"
        },
        {
            "port_group": "Mora Group Port",
            "port_name": "Panvel (Ulva - Belapur)"
        },
        {
            "port_group": "Mora Group Port",
            "port_name": "Mora"
        },
        {
            "port_group": "Mora Group Port",
            "port_name": "Karanja (Rewas-Dharamtar)"
        },
        {
            "port_group": "Mora Group Port",
            "port_name": "Mandawa"
        },
        {
            "port_group": "Mora Group Port",
            "port_name": "Thane"
        },
        {
            "port_group": "Mora Group Port",
            "port_name": "Bhiwandi"
        },
        {
            "port_group": "Mora Group Port",
            "port_name": "Vasai"
        },
        {
            "port_group": "Mora Group Port",
            "port_name": "Kalyan"
        },
        {
            "port_group": "Rajpuri Group of Ports",
            "port_name": "Thal"
        },
        {
            "port_group": "Rajpuri Group of Ports",
            "port_name": "Alibaug"
        },
        {
            "port_group": "Rajpuri Group of Ports",
            "port_name": "Rewdanda"
        },
        {
            "port_group": "Rajpuri Group of Ports",
            "port_name": "Borli-Mandla"
        },
        {
            "port_group": "Rajpuri Group of Ports",
            "port_name": "Nandgaon "
        },
        {
            "port_group": "Rajpuri Group of Ports",
            "port_name": "Murud"
        },
        {
            "port_group": "Rajpuri Group of Ports",
            "port_name": "Dighi"
        },
        {
            "port_group": "Rajpuri Group of Ports",
            "port_name": "Mandad"
        },
        {
            "port_group": "Rajpuri Group of Ports",
            "port_name": "Kumbharu"
        },
        {
            "port_group": "Rajpuri Group of Ports",
            "port_name": "Shriwardhan"
        },
        {
            "port_group": "Ratnagiri Group Of Ports",
            "port_name": "Bankot"
        },
        {
            "port_group": "Ratnagiri Group Of Ports",
            "port_name": "Borya"
        },
        {
            "port_group": "Ratnagiri Group Of Ports",
            "port_name": "Dabhol"
        },
        {
            "port_group": "Ratnagiri Group Of Ports",
            "port_name": "Harnai"
        },
        {
            "port_group": "Ratnagiri Group Of Ports",
            "port_name": "Jaigad"
        },
        {
            "port_group": "Ratnagiri Group Of Ports",
            "port_name": "Kelashi"
        },
        {
            "port_group": "Ratnagiri Group Of Ports",
            "port_name": "Palshet"
        },
        {
            "port_group": "Ratnagiri Group Of Ports",
            "port_name": "Ratnagiri"
        },
        {
            "port_group": "Ratnagiri Group Of Ports",
            "port_name": "Varwade"
        },
        {
            "port_group": "Vengurla Group Of Ports",
            "port_name": "Aachare"
        },
        {
            "port_group": "Vengurla Group Of Ports",
            "port_name": "Devgad"
        },
        {
            "port_group": "Vengurla Group Of Ports",
            "port_name": "Purngad"
        },
        {
            "port_group": "Vengurla Group Of Ports",
            "port_name": "Vijaydurg"
        },
        {
            "port_group": "Vengurla Group Of Ports",
            "port_name": "Jaitapur"
        },
        {
            "port_group": "Vengurla Group Of Ports",
            "port_name": "Kiranpani"
        },
        {
            "port_group": "Vengurla Group Of Ports",
            "port_name": "Redi"
        },
        {
            "port_group": "Vengurla Group Of Ports",
            "port_name": "Niwati "
        },
        {
            "port_group": "Vengurla Group Of Ports",
            "port_name": "Vengurla"
        },
        {
            "port_group": "Vengurla Group Of Ports",
            "port_name": "Malvan"
        }
    ];

In this response most of port_group are same and every port_name of port_group is different

This is .ts code

var newJsonFile = _.uniqBy(jsonarray, 'port_group'); 
   //var filtered =  _.uniqWith(jsonarray, _.isEqual);
  this.information = newJsonFile;

This is i am getting after using this code

I am getting the result:

Bandra Group Of Ports

• Dahanu

But I need this result:

Bandra Group Of Ports

• Dahanu
• Tarapur
• Navapur
• Satpati
• Kelwa mahim
• Arnala
• Versova

Please help to solve this issue.

Answer 1

You can use array#reduce to group your data based on port_group .

 var data = [{ "port_group": "Bandra Group Of Ports", "port_name": "Dahanu" }, { "port_group": "Bandra Group Of Ports", "port_name": "Tarapur" }, { "port_group": "Bandra Group Of Ports", "port_name": "Navapur" }, { "port_group": "Bandra Group Of Ports", "port_name":"Satpati" }, { "port_group": "Bandra Group Of Ports", "port_name": "Kelwa mahim" }, { "port_group": "Bandra Group Of Ports", "port_name": "Arnala" }, { "port_group": "Bandra Group Of Ports", "port_name": "Uttan" }, { "port_group": "Bandra Group Of Ports","port_name": "Versova" }, { "port_group": "Bandra Group Of Ports", "port_name": "Marve-Manori" }, { "port_group": "Bandra Group Of Ports", "port_name": "Bandra" }, { "port_group": "Mora Group Port", "port_name": "Trombay" }, { "port_group": "Mora GroupPort", "port_name": "Panvel (Ulva - Belapur)" }, { "port_group": "Mora Group Port", "port_name": "Mora" }, { "port_group": "Mora Group Port", "port_name": "Karanja (Rewas-Dharamtar)" }, { "port_group": "Mora Group Port", "port_name": "Mandawa" }, { "port_group":"Mora Group Port", "port_name": "Thane" }, { "port_group": "Mora Group Port", "port_name": "Bhiwandi" }, { "port_group": "Mora Group Port", "port_name": "Vasai" }, { "port_group": "Mora Group Port", "port_name": "Kalyan" }, { "port_group": "Rajpuri Groupof Ports", "port_name": "Thal" }, { "port_group": "Rajpuri Group of Ports", "port_name": "Alibaug" }, { "port_group": "Rajpuri Group of Ports", "port_name": "Rewdanda" }, { "port_group": "Rajpuri Group of Ports", "port_name": "Borli-Mandla" }, { "port_group":"Rajpuri Group of Ports", "port_name": "Nandgaon " }, { "port_group": "Rajpuri Group of Ports", "port_name": "Murud" }, { "port_group": "Rajpuri Group of Ports", "port_name": "Dighi" }, { "port_group": "Rajpuri Group of Ports", "port_name": "Mandad" },{ "port_group": "Rajpuri Group of Ports", "port_name": "Kumbharu" }, { "port_group": "Rajpuri Group of Ports", "port_name": "Shriwardhan" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Bankot" }, { "port_group": "Ratnagiri Group Of Ports","port_name": "Borya" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Dabhol" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Harnai" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Jaigad" }, { "port_group": "RatnagiriGroup Of Ports", "port_name": "Kelashi" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Palshet" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Ratnagiri" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Varwade"}, { "port_group": "Vengurla Group Of Ports", "port_name": "Aachare" }, { "port_group": "Vengurla Group Of Ports", "port_name": "Devgad" }, { "port_group": "Vengurla Group Of Ports", "port_name": "Purngad" }, { "port_group": "Vengurla Group Of Ports","port_name": "Vijaydurg" }, { "port_group": "Vengurla Group Of Ports", "port_name": "Jaitapur" }, { "port_group": "Vengurla Group Of Ports", "port_name": "Kiranpani" }, { "port_group": "Vengurla Group Of Ports", "port_name": "Redi" }, { "port_group":"Vengurla Group Of Ports", "port_name": "Niwati " }, { "port_group": "Vengurla Group Of Ports", "port_name": "Vengurla" }, { "port_group": "Vengurla Group Of Ports", "port_name": "Malvan" }], result = Object.values(data.reduce((r,o) => { r[o.port_group] = r[o.port_group] || {name: o.port_group, children: []}; r[o.port_group].children.push({port_name: o.port_name}); return r; },{})); console.log(result); 

Answer 2

Using Lodash's _.groupBy() , _.map() and _.mapValues() :

_(input).groupBy('port_group').mapValues(ps => _(ps).map(p => p.port_name));

Complete snippet:

 const input = [{ "port_group": "Bandra Group Of Ports", "port_name": "Dahanu" }, { "port_group": "Bandra Group Of Ports", "port_name": "Tarapur" }, { "port_group": "Bandra Group Of Ports", "port_name": "Navapur" }, { "port_group": "Bandra Group Of Ports", "port_name": "Satpati" }, { "port_group": "Bandra Group Of Ports", "port_name": "Kelwa mahim" }, { "port_group": "Bandra Group Of Ports", "port_name": "Arnala" }, { "port_group": "Bandra Group Of Ports", "port_name": "Uttan" }, { "port_group": "Bandra Group Of Ports", "port_name": "Versova" }, { "port_group": "Bandra Group Of Ports", "port_name": "Marve-Manori" }, { "port_group": "Bandra Group Of Ports", "port_name": "Bandra" }, { "port_group": "Mora Group Port", "port_name": "Trombay" }, { "port_group": "Mora Group Port", "port_name": "Panvel (Ulva - Belapur)" }, { "port_group": "Mora Group Port", "port_name": "Mora" }, { "port_group": "Mora Group Port", "port_name": "Karanja (Rewas-Dharamtar)" }, { "port_group": "Mora Group Port", "port_name": "Mandawa" }, { "port_group": "Mora Group Port", "port_name": "Thane" }, { "port_group": "Mora Group Port", "port_name": "Bhiwandi" }, { "port_group": "Mora Group Port", "port_name": "Vasai" }, { "port_group": "Mora Group Port", "port_name": "Kalyan" }, { "port_group": "Rajpuri Group of Ports", "port_name": "Thal" }, { "port_group": "Rajpuri Group of Ports", "port_name": "Alibaug" }, { "port_group": "Rajpuri Group of Ports", "port_name": "Rewdanda" }, { "port_group": "Rajpuri Group of Ports", "port_name": "Borli-Mandla" }, { "port_group": "Rajpuri Group of Ports", "port_name": "Nandgaon " }, { "port_group": "Rajpuri Group of Ports", "port_name": "Murud" }, { "port_group": "Rajpuri Group of Ports", "port_name": "Dighi" }, { "port_group": "Rajpuri Group of Ports", "port_name": "Mandad" }, { "port_group": "Rajpuri Group of Ports", "port_name": "Kumbharu" }, { "port_group": "Rajpuri Group of Ports", "port_name": "Shriwardhan" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Bankot" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Borya" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Dabhol" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Harnai" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Jaigad" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Kelashi" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Palshet" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Ratnagiri" }, { "port_group": "Ratnagiri Group Of Ports", "port_name": "Varwade" }, { "port_group": "Vengurla Group Of Ports", "port_name": "Aachare" }, { "port_group": "Vengurla Group Of Ports", "port_name": "Devgad" }, { "port_group": "Vengurla Group Of Ports", "port_name": "Purngad" }, { "port_group": "Vengurla Group Of Ports", "port_name": "Vijaydurg" }, { "port_group": "Vengurla Group Of Ports", "port_name": "Jaitapur" }, { "port_group": "Vengurla Group Of Ports", "port_name": "Kiranpani" }, { "port_group": "Vengurla Group Of Ports", "port_name": "Redi" }, { "port_group": "Vengurla Group Of Ports", "port_name": "Niwati " }, { "port_group": "Vengurla Group Of Ports", "port_name": "Vengurla" }, { "port_group": "Vengurla Group Of Ports", "port_name": "Malvan" } ]; const output = _(input).groupBy('port_group').mapValues(ps => _(ps).map(p => p.port_name)); console.log(output); 

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