I want to get the index of filtered array
const arr = ['apple', 'mango', 'orange', 'banana'];
const customFilter = (arr, searchtxt) => {
const result = [];
arr.filter(fruit => fruit.match(searchtxt)).forEach((element, index) => {
result.push(index);
});
return result;
}
console.log(customFilter(arr, 'ma'));You can use reduce. For each item in the input, the code below adds its index to an array if it matches the given string.
const arr = ['apple', 'mango', 'orange', 'banana'];
const customFilter = (arr, searchtxt) => {
return arr.reduce((a, c, i) => c.match(searchtxt) ? [...a, i] : a, [])
}
console.log(customFilter(arr, 'ma'));You're returning the index in the filtered array, not its index in the original array.
Don't use filter() for this. Just use forEach(), pushing the index into the result.
const arr = ['apple', 'mango', 'orange', 'banana'];
const customFilter = (arr, searchtxt) => {
const result = [];
arr.forEach((fruit, index) => {
if (fruit.match(searchtxt)) {
result.push(index);
}
})
return result;
}
console.log(customFilter(arr, 'ma'));