Answers for "how to prevent to insert duplicate data in array in javascript"

95

js remove duplicates from array

const names = ['John', 'Paul', 'George', 'Ringo', 'John'];

let unique = [...new Set(names)];
console.log(unique); // 'John', 'Paul', 'George', 'Ringo'
Posted by: Guest on March-11-2020
0

prevent duplicate entries in javascript array

if (array.indexOf(value) === -1) array.push(value);
Posted by: Guest on March-01-2021

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