Question 327100 in Javascript Question posted in
A very good W3school tutorial can be found here.

Javascript – Access Object value in a string and compare

var siteList = {};
var siteInfo = [];
var part_str = '[{"part":"00000PD","partSupplier":"DELL"}]';
var part =  part_str.substring(1,part_str.length-1);

eval('var partobj='+part );
console.log(partobj.part);
console.log(partobj.partSupplier);

The above code works fine.
But I have to find out if the part number matches the following part; if not, the partSupplier will be added to the following json; else not.

if (partobj.part.includes("00000PD")){
  var partSupp= partobj.partSupplier;
} else {
  partSupp= "HP";
}

siteInfo = {
  "Parts_Num": part,
  "partSupplier": partSupp
}
siteList.siteInfo.push(siteInfo);

I tried the following, but the partSupplier value is empty:

if (partobj.part.includes("00000PD")){
  var  partSupp = [partobj.partSupplier];
  console.log('partSupp' || partSupp);
} else {
  partSupp = "HP";
}

The result from the console:

partSupp
It does not return any value.

I am using console.log to test the output before plugging the code.

Tags:

2

Answers


  1. 0

    Use JSON.parse to get an array from the string, then use Array#find to get the object with a matching part.

    const part_str = '[{"part":"00000PD","partSupplier":"DELL"}]';
const arr = JSON.parse(part_str);
const match = arr.find(o => o.part.includes("00000PD"));
if (match) {
  console.log(match.partSupplier);
}
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  2. 0

    This makes a modification to your original questions.

    The highlight is at like, 5, where the part_str is converted to JSON array, then like 7 picked the first item – I assume this is what you want to do.

    Then check if the partObj.part contains the particular string to get the partSupplier, else return "HP"

    Finally use the information to create a siteInfo object before pushing it to the siteList object

    var siteList = {
  siteInfo []
};
var part_str = '[{"part":"00000PD","partSupplier":"DELL"}]';

const partArr = JSON.parse(part_str)

var partObj = partArr[0]
var partSubpp = partObj?.part?.includes("00000PD") ? partObj.partSupplier : "HP"

siteInfo = {
  "Parts_Num": part,
  "partSupplier": partSupp
}
siteList.siteInfo.push(siteInfo);
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