Iterating through an array with a fakeAPI promise function Vue.js - arrays

Question

<template>
<div class="hello">
<h1>Example 2</h1>
<input #click="send" type="button" value="Send" />
<div class="out" v-if="successIds.length">{{ successIds }}</div>
</div>
</template>
<script>
/*
#return
resolve: { id: 1, success: true }
or
reject: { success: false }
*/
const fakeApiRequest = (id) => {
return new Promise((resolve, reject) => {
setTimeout(() => {
const success = id % 2;
success ? resolve({ id, success }) : reject({ success });
}, 2000);
});
};
export default {
data() {
return {
// Fetch ids
ids: [1, 2, 3, 4, 5, 6],
// Complete ids
successIds: [],
};
},
methods: {
// iterating through the ids array
newValues(id) {
this.ids.forEach((el) => el.this.fakeApiRequest(id));
},
// filling the successIds array
send(id) {
this.$set(this, "successIds", this.newValues(id));
},
},
};
</script>
How can I fill and display the successId array in the template with the iterated elements of the existing array using Promise function within a $set Vue method? I seem to fail trying to reach the fakeApiRequest in the newValues function.

Answer 1

I'm not sure why you think you need to use the $set method. There are clear documented uses for it, and setting/replacing an array is not one. Besides that though, to be frank, there are a lot of issues with your code, and it's not very clear what you're trying to do, but I did my best to correct all the issues and left comments describing my changes.
sandbox example
<template>
<div class="hello">
<h1>Example 2</h1>
<input type="button" value="Send" #click="send" />
<div v-if="successIds.length" class="out">{{ successIds }}</div>
</div>
</template>
<script>
export default {
data() {
return {
// Fetch ids
ids: [1, 2, 3, 4, 5, 6],
// Complete ids
successIds: []
};
},
methods: {
// note 1: method loops through all ids so not sure what the 'id' param is for
// note 2: calling other async methods requires we use 'async' and 'await' keywords
async newValues(id) {
// note 3: the code in this method before was non-sensical to me, e.g. "el.this.fakeApiRequest" isn't valid syntax
// and the forEach loop didn't do anything with the actual result returned by fakeApiRequest.
// note 4: forEach actually isn't designed for async code. Must use normal for loop
const results = [];
for (let i = 0; i < this.ids.length; i++) {
let res = null;
try {
res = await this.fakeApiRequest(this.ids[i]);
} catch (rejectVal) {
res = rejectVal;
}
console.log('res', res);
results.push(res);
}
return results;
},
// note 5: not sure why id is a param as this method isn't called with any specific id
async send(id) {
// note 6: the use of $set before was unnecessary
this.successIds = await this.newValues();
},
/*
#return
resolve: { id: 1, success: true }
or
reject: { success: false }
*/
// note 7: moved this here so it can be called by other methods. decreased timeout time for sanity's sake
fakeApiRequest(id) {
return new Promise((resolve, reject) => {
setTimeout(() => {
const success = id % 2;
success ? resolve({ id, success }) : reject({ success });
}, 100);
});
}
}
};
</script>