String operation in nodejs Objects

Question

I have a scenario in nodeJS.

I have an object which contains number of elements and array

var Obj = {
  count: 3,
  items: [{
      "organizationCode": "FP1",
      "organizationName": "FTE Process Org"
    },
    {
      "organizationCode": "T11",
      "organizationName": "FTE Discrete Org"
    },
    {
      "organizationCode": "M1",
      "organizationName": "Seattle Manufacturing"
    }
  ]
};

The scenario is like this. I have to filter result based on criteria. I have print output if either organizationCode or organizationName starts with particular character or ends with or it contains particular word. for eg if user enters starts with M or starts with "M" below should return

{
  "organizationCode": "M1",
  "organizationName": "Seattle Manufacturing"
}

if user enters ends with org then

{
  "organizationCode": "FP1",
  "organizationName": "FTE Process Org"
}, {
  "organizationCode": "T11",
  "organizationName": "FTE Discrete Org"
},

and if it enters contains 11 then below should return.

{
  "organizationCode": "T11",
  "organizationName": "FTE Discrete Org"
},

I have thousands of record. I am looking for optimize way to get output. I am new to NodeJs so struggling to complete it.

you can do as and change "11" according to your search string: let result = Obj.items.filter(i => (i.organizationCode.includes('11') || i.organizationName.includes('11'))); — Muhammad Sadiq
– Muhammad Sadiq, Commented May 20, 2020 at 23:53
ya I want same answer. only issue is there input is array and in my question input is object. I am new to java script so i am not able to modify filter. it is giving can not read filter error. — Shruti sharma
– Shruti sharma, Commented May 21, 2020 at 0:13

halilcakar · Accepted Answer · 2020-05-21 00:27:18Z

4

First thing first. here some string functions that u can use:

endsWith "some string".endsWith('string')

startsWith "some string".startsWith('some')

includes "some string".includes('ome')

And you can convers object with Object.values().

But if i was doing this, i would probably tho something like following,

// I'm assuming in the nodejs you would have some variables to search for
// like whereToSearch and whatToSearch lets say

var arrToSearch = [
  { organizationCode: "FP1", organizationName: "FTE Process Org" },
  { organizationCode: "T11", organizationName: "FTE Discrete Org" },
  { organizationCode: "M1", organizationName: "Seattle Manufacturing" },
];

function search(arr, whereToSearch, whatToSearch) {
  return arr.filter(
    (ch) =>
      ch.organizationCode[whereToSearch](whatToSearch) ||
      ch.organizationName[whereToSearch](whatToSearch)
  );
}

console.log(search(arrToSearch, "endsWith", "11"));

// We can also send the array to function so in this case your object is here
var object = {
  count: 3,
  items: [
    {
      organizationCode: "FP1",
      organizationName: "FTE Process Org",
    },
    {
      organizationCode: "T11",
      organizationName: "FTE Discrete Org",
    },
    {
      organizationCode: "M1",
      organizationName: "Seattle Manufacturing",
    },
  ],
};
//and what you can do with this is

console.log(search(object.items, "startsWith", "FTE"));

edited May 21, 2020 at 0:27

answered May 21, 2020 at 0:03

halilcakar

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5 Comments

Marco Over a year ago

Very nice solution, I like it!

Shruti sharma Over a year ago

This answer is perfect. only difference is in this answer input is array and here we have input as an object. can you pls suggest modification? stackoverflow.com/a/61909390/13512204

halilcakar Over a year ago

Hope the modification is answers your question :)

Shruti sharma Over a year ago

When I am printing obj.items using console.log it is giving undefined.

halilcakar Over a year ago

Can you try it again, just copy all code, paste into a test.js file and node test.js

Marco · Accepted Answer · 2020-05-21 00:03:38Z

1

You can use Array.filter in conjunction with String.startsWith, String.includes and String.endsWith.

answered May 21, 2020 at 0:03

Marco

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1 Comment

Shruti sharma Over a year ago

can you help me to modify this answer. in this answer input is an array. in my question input is an object. filter is giving error. stackoverflow.com/a/61909390/13512204

Ionut Eugen · Accepted Answer · 2020-05-21 00:10:10Z

You can use an array filter, to go trough all of the elements and process them as you need.

Also to check if a string contains another string you can use an insensitive match on it.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

var Obj = {
	count: 3,
	items: [
		{
			organizationCode: "FP1",
			organizationName: "FTE Process Org",
		},
		{
			organizationCode: "T11",
			organizationName: "FTE Discrete Org",
		},
		{
			organizationCode: "M1",
			organizationName: "Seattle Manufacturing",
		},
	],
};

const filter = (starts_with, ends_with, contains) => {
    const result = Obj.items.filter(item => {
        if(starts_with){
            return (
                item.organizationCode[0].toLowerCase() === starts_with.toLowerCase() ||
                item.organizationName[0].toLowerCase() === starts_with.toLowerCase()
            ) ? true : false
        } else 
        if(ends_with) {
            return (
                item.organizationCode[item.organizationCode.length].toLowerCase() === ends_with.toLowerCase() ||
                item.organizationName[item.organizationName.length].toLowerCase() === ends_with.toLowerCase()
            ) ? true : false
        } else {
            return (
                item.organizationCode.match(contains,'i') ||
                item.organizationName.match(contains,'i')
            ) ? true : false
        }
    });
    return result;
};

console.log(filter("F",null,null)); // test run

Daniel Duarte · Accepted Answer · 2020-05-21 00:27:51Z

Here is a simple solution analyzing initially the user condition and the filtering your list.

It has several improvement points but it is a good start.

const analyzeCond = condition => {
  let conditionParts = condition.split(' ').filter(str => str !== '');
  if (conditionParts.length < 3) {
    return null;
  }
  // Check field
  const fieldName = conditionParts.shift();

  if (!['organizationCode', 'organizationName'].includes(fieldName)) {
    return null;
  }

  // Check operator
  const operator = conditionParts.shift();
  if (['starts', 'ends'].includes(operator)) {
    const withWord = conditionParts.shift();
    if (withWord !== 'with') {
      return null;
    }
  } else if (operator !== 'contains'){
    return null;
  }

  const userText = conditionParts.join(' ');

  return { fieldName, operator, userText };
};

const compareFns = {
  starts: (query, text) => text.startsWith(query),
  ends: (query, text) => text.endsWith(query),
  contains: (query, text) => text.includes(query),
};

const filter = (list, userInput) => {
  const condition = analyzeCond(userInput);
  if (condition === null) {
    return null;
  }

  // Filter based on user input
  return list.filter(item => {
    return compareFns[condition.operator](condition.userText, item[condition.fieldName]);
  });
};


const obj = {
  count: 3,
  items: [{
    "organizationCode": "FP1",
    "organizationName": "FTE Process Org"
  },
    {
      "organizationCode": "T11",
      "organizationName": "FTE Discrete Org"
    },
    {
      "organizationCode": "M1",
      "organizationName": "Seattle Manufacturing"
    }]
};

// Example execution with ugly but possible user input
const result = filter(obj.items, '    organizationName      starts     with      Seattle Ma');
if (result !== null) {
  console.log('Filter result', result);
} else {
  console.log('The user input has not the expected format');
}

Things to check:

Check if you want to support multiple continued space characters or not (you can adapt this code if needed).
You could easily add more operators or fields to compare against.
If the user conditions you want to support in the future are more complex I'd recommend to use a parser package to not reinvent the well.
If you are in big project and want to implement complex searches, consider using services like ElasticSearch.

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