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Javascript – Remove duplicates in array which numbers are in string format?

Remove duplicates in an Array with numbers in string format?

I have snippet like how to remove duplicates from and array. I tried using filter method but its working with only numbers, But my array contains numbers in string format. So i am in confusion how to solve it.

// output = [1,2,3,4,5,6,7]

const arr1 = [1,2,"1",3,2,4,"3",5,6,7,6,"5"];

const result = arr1.filter((item, index) => arr1.indexOf(item) === index)

console.log(result);

// my result 
// [1, 2, "1", 3, 4, "3", 5, 6, 7, "5"]

// But output should be = [1,2,3,4,5,6,7]

Thanks in advance friends

Remove duplicates in an Array with numbers in string format?

I have snippet like how to remove duplicates from and array. I tried using filter method but its working with only numbers, But my array contains numbers in string format. So i am in confusion how to solve it.

// javascript

// output = [1,2,3,4,5,6,7]

const arr1 = [1,2,"1",3,2,4,"3",5,6,7,6,"5"];

const result = arr1.filter((item, index) => arr1.indexOf(item) === index)

//console.log(result);

// my result 

// [1, 2, "1", 3, 4, "3", 5, 6, 7, "5"]

// But output should be = [1,2,3,4,5,6,7]

Thanks in advance friends

    // output = [1,2,3,4,5,6,7] const arr1 = [1,2,"1",3,2,4,"3",5,6,7,6,"5"]; const result = arr1.filter((item, 

index) => arr1.indexOf(item) === index) console.log(result); // my result 

// [1, 2, "1", 3, 4, "3", 5, 6, 7, "5"] 

// But output should be = [1,2,3,4,5,6,7]

Thanks in advance friends`

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3

Answers


  1. 0

    You can use Number() to convert string to number and then filter it,below is a reference for you

    const arr1 = [1,2,"1",3,2,4,"3",5,6,7,6,"5"];

const filterArr = (data) =>{
  data = data.filter((e, i) => data.indexOf(Number(e)) === i)
  return data
}

console.log(filterArr(arr1))
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  2. 0

    You could just parse the strings as a number with parseInt(item) and then compare those. This code will parse strings as Int and then filter those.

    let arr1 = [1,2,"1",3,2,4,"3",5,6,7,6,"5"];

arr1 = arr1.map(m => parseInt(m));

const result = arr1.filter((item, index) => arr1.indexOf(item) === index)

console.log(result);
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  3. 0

    Consider:

    const arr1 = [1,2,"1",3,2,4,"3",5,6,7,6,"5"];

const result = [...new Set(arr1.map(Number))]

console.log(result);

    What this does is:

    • convert everything to a number (map(Number))
    • turn an array into a Set (means no duplicates)
    • convert that set back into an array with [...]
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