[JavaScript]filter / CallbackFunction /
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How to use filter in JavaScript
arrayName.filter((element, index) => element !== arr[index+1];
const arr =[1,1,2,2,3,3];
const answer = arr.filter((x,y) => x !== arr[y+1]);
console.log(answer);
//expacted result : [1,2,3]
x -> value (ex. 1) y -> index (ex. [0])
filter will scan all the elements in the array and filter which is matched with the condition.
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