Typescript Object [object Array] has no method 'includes' with Ionic 3

Question

I got this error when I try to execute the following code, I am using Ionic3 framework:

ERROR TypeError {stack: "TypeError: Object [object Array] has no method 'in… (http://192.168.0.25:8100/build/main.js:4116:76)", message: "Object [object Array] has no method 'includes'"}

// console.log(this.events) => [7704] 
// console.log(event.id_calenda) => 7653 
if (this.events.includes(event.id_calendar)) {

It happens in my device with Android 4.4.4, the other one with Android 7 works good, why?

Probably because the Browser on your old device only supports an older version of EcmaScript — Thomas
– Thomas, Commented Feb 12, 2018 at 23:32
Agreed, the older browsers don't support .includes. You'll need to use a polyfill for it to work on those older browsers. — CRice
– CRice, Commented Feb 12, 2018 at 23:37

Otto · Accepted Answer · 2018-09-28 16:03:38Z

9

I fixed it using Array.prototype.indexOf() instead of Array.prototype.includes():

if (this.events.indexOf(event.id_calender) >= 0) {

Array.prototype.indexOf() documentation

Array.prototype.includes() documentation

edited Sep 28, 2018 at 16:03

answered Feb 13, 2018 at 10:30

Otto

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1 Comment

MichaelM Over a year ago

indexOf counts from 0, so will return 0 if the item is first in the array. indexOf returns -1 if the item is not in the array. So the code should be changed to: if (this.events.indexOf(event.id_calender) >= 0) {

Alexander Fedorov · Accepted Answer · 2018-05-10 06:22:18Z

4

I have the same error on Android 4.4.2, but it's needed to use >= operator to replace Array.prototype.includes() method:

if (this.events.indexOf(event.id_calendar) >= 0) {

answered May 10, 2018 at 6:22

Alexander Fedorov

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