JavaScript string interpolation on strings assigned as property values in objects

Question

I have the following object:

var obj = {
   number: "123456789"
   tel: `The clients phone number is ${number}. Please call him!`

How can I insert the number value in the tel-string?

Declare and assign a value to number variable before declaring the obj variable. — Prerak Sola
– Prerak Sola, Commented Oct 15, 2019 at 13:38
^^ That. The properties don't exist until you terminate the object initialisation, so number does not yet exist as a variable. Alternatively, don't add tel until afterwards... obj.tel = `The clients phone number is ${obj.number}. Please call him!` — Reinstate Monica Cellio
– Reinstate Monica Cellio, Commented Oct 15, 2019 at 13:39

Christian C. Salvadó · Accepted Answer · 2019-10-15 13:42:23Z

8

You cannot access the object while is being initialized. You can either assign the property after the object initialization or you can define a getter property:

const obj = {
  number: "123456789",
  get tel() {
    return `The clients phone number is ${this.number}. Please call him!`;
  }
};

console.log(obj.tel);

edited Oct 15, 2019 at 13:42

answered Oct 15, 2019 at 13:40

Christian C. Salvadó

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1 Comment

Felix Kling Over a year ago

@Dalorzo: FWIW, developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… says it's supported in Edge.

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