Good day everyone, I'm trying to obtain the numerical value of 'review' what happens is that in the JSON it returns it as a String and therefore I cann't perform a sum that I did, resulting in a meaningless value
The objective is that, when someone makes a comment about an X product, the data is saved in Firebase in a JSON, the problem is that 'review' is saved as a String and not saved as a number
Is there a way to take this single piece of data and convert it to number?
This is the JSON response
"[{\"review\":\"4\",\"comment\":\"Good product \",\"name\":\"SnowFall\",\"image\":\"https://lh3.googleusercontent.com\",\"method\":\"google\"}]"
This is my TypeScript
callback(i, totalReviews) {
if (!this.render) {
this.render = true;
let globalRating = 0;
let globalReviews = 0;
setTimeout(function () {
totalReviews.forEach((review, index) => {
globalRating += review.length;
for (const i in review) {
globalReviews += review[i].review;
console.log("globalReviews", globalReviews);
}
})
console.log("Raiting", globalRating);
console.log("Reviews", globalReviews);
let averageReviews = Math.round(globalReviews / globalRating);
let precentage = Math.round(globalReviews * 100 / (globalRating * 5));
$(".globalRating").html(globalRating);
$(".percentage").html(precentage);
let averageRating = DinamicReviews.fnc(averageReviews);
$(".br-theme-fontawesome-stars").html(`
<select class="ps-rating reviewsOption" data-read-only="true"></select>
`)
for (let i = 0; i < averageRating.length; i++) {
$(".reviewsOption").append(`
<option value="${averageRating[i]}">${i + 1}</option>
`)
}
Rating.fnc();
}, i * 10)
}
}
This is how it is saved in FireBase FireBase RealTime Database
This is how it looks on my FrontEnd FrontEnd
There is a line where you assign the .review value to the globalReviews variable as this is using += this shall be concatenating the string and that is the problem you are facing.
If you change that same line to: globalReviews += +review[i].review;
This will fix the error.
The reason why adding a + sign in front of a variable works is because this sign is known as the Unary Plus Operator which converting the value to a number or in case the store value is not a number it will convert following the Unary Plus Operator documentation
To make this code safe and thus not add a possible NaN you can failsafe to 0 by using the following syntax globalReviews += +review[i].review || 0;
