Looking for a solution to eliminate duplicate values in the storage array within Ionic3
this.storage.get('thestations').then((val) => {
for(let i =0;i<val.length;i++){
if(this.newarray.indexOf(this.newarray) == -1) {
this.newarray.push(val[i]);
}
console.log(newarray);
});
Despite the efforts, duplicates are still being returned
Utilizing Set Method
let fruits = ["Banana", "Orange", "Apple", "Mango", "Mango"];
let uniqueFruits = Array.from(new Set(fruits));
Verification using Reduce Function
let fruits = ["Banana", "Orange", "Apple", "Mango", "Mango"];
let uniqueFruits = fruits.reduce(function(result, element) {
if(result.indexOf(element)==-1)
result.push(element);
return result;
}, [])
Quick summary:
[...new Set(["Grapes", "Pineapple", "Kiwi", "Watermelon", "Watermelon"])]this.data.retrieve('thecities').then(data => {
console.log('original list', data);
console.log('unique values', [...new Set(data)]);
})
Whether or not you have already found a solution to your problem, I am here to offer you one of the most effective answers.
When it comes to Javascript, we have access to the powerful lodash library. For detailed information, please check out the Lodash Documentation
Lodash is packed with numerous built-in functions such as filter, unique, isEqual, and many more.
Step 1: Start by installing the npm package for lodash using the following command.
npm install lodash --save
Step 2: Next, import the dependency into your component file.
import * as lodash from 'lodash';
Step 3: Imagine you have an array named abcArr = [5,10, 8, 11, 10, 8]; And you want to remove all duplicate numbers.
Simply use the code snippet below to achieve the desired outcome.
let abcArr = [5,10, 8, 11, 10, 8];
let uniqueArr = [];
uniqueArr = lodash.uniqWith(abcArr, lodash.isEqual);
This will provide you with the solution you are looking for. Hopefully, this helps!
To achieve this, you will need to utilize a function similar to the one shown below
var values = ["Banana", "Orange", "Apple", "Mango", "Mango"];
var newArray = [];
for(let i=0; i < values.length; i++)
{
if(newArray.indexOf(values[i]) == -1)
newArray.push(values[i]);
}
console.log(newArray);
</script>
Remember, you can personalize the values variable based on your specific needs.
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