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?

Answer 1

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