Using if/else to define const in Javascript

Question

I'm using const in a function to define a few variables as follows

const printBlock.format({
  name : this.matchedData.clientName,
  date : this.matchedData.jobDate,
  destination : this.matchedData.address,
  apartment : this.matchedData.address2,
  stateZip : this.matchedData.zipcode
})

From then, I'm printing out all of these things in order that they're declared. However, some of the data doesn't have an apartment number so it'll show up as:

John Doe

6/6/2018

135 Testdemo Avenue

null

NY 11111

Is it possible to use an if function within declaring the consts in order to make it so that:

if (this.matchedData.address2 == null){
//Do nothing
} else {
apartment : this.matchedData.address2,
}

const printBlock({…}) is a syntax error. What are you actually doing? — Bergi
– Bergi, Commented Jun 6, 2018 at 19:50

Hayden Carlson · Accepted Answer · 2018-06-06 19:48:32Z

3

No, but you can use a ternary

var object = {
  address: '1111',
  apartment : this.matchedData.address2 ? "" : this.matchedData.address2
}

answered Jun 6, 2018 at 19:48

Hayden Carlson

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2 Comments

Luca Kiebel Over a year ago

This approach will also create a property even if it's null

Keyadun Over a year ago

This is the solution that worked for me! I ended up formatting as follows: apartment : ((this.matchedData.address2 !== null) ? this.matchedData.address2 : ' ')

Nina Scholz · Accepted Answer · 2018-06-06 19:53:18Z

1

You could use Object.assign and check with property and if not null, take an object for assignment.

printBlock(Object.assign(
    {
        name: this.matchedData.clientName,
        date: this.matchedData.jobDate,
        destination: this.matchedData.address,
        apartment: this.matchedData.address2,
        stateZip: this.matchedData.zipcode
    }, 
    this.matchedData.address2 === null || { apartment: this.matchedData.address2 }    
));

answered Jun 6, 2018 at 19:53

Nina Scholz

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Comments

Matt Coarr · Accepted Answer · 2018-06-06 19:55:12Z

1

You can create your object first without the apartment entry and then add the apartment entry if it is not null...

const a = {
  name : this.matchedData.clientName,
  date : this.matchedData.jobDate,
  destination : this.matchedData.address,
  stateZip : this.matchedData.zipcode
};

if (this.matchedData.address2 !== null){
  a.apartment : this.matchedData.address2;
}

answered Jun 6, 2018 at 19:55

Matt Coarr

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Comments

sgj88_ · Accepted Answer · 2018-06-06 20:17:28Z

0

const printBlock({...}) will throw an error because it isn't a valid way to initialize a constant. If printBlock is a function, why not handle null values in the body of printBlock?

function printBlock(obj) {
    for (var prop in obj) {
        if (obj[prop]) {
            console.log(obj[prop]); // or do whatever you mean by 'print'
        }
    }
}

edited Jun 6, 2018 at 20:17

answered Jun 6, 2018 at 20:09

sgj88_

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