배열에서 유일한 값만 추리기 (Get only unique values in an array) 기본 알고리즘 const source = [1, 2, 3, 2, 4, 5, 3, 3, 7]; for (let indexLeader = 0, lengthLeader = source.length; indexLeader < lengthLeader; indexLeader += 1) { // console.group(`leader index${indexLeader}`, source[indexLeader], source); for (let indexFollower = indexLeader + 1, lengthFollower = source.length; indexFollower < lengthFollower; indexFollower += 1) { // console.log('follower', indexFollower, source[indexFollower]); if (indexLeader === indexFollower) continue; if (source[indexLeader] === source[indexFollower]) { // console.log('-deleted', indexFollower, source[indexFollower], source); source.splice(indexFollower, 1); // console.log('*after deleted', indexFollower, source); indexLeader -= 1; indexFollower -= 1; lengthLeader -= 1; lengthFollower -= 1; } } // console.groupEnd(`index${indexLeader}`); } => [1, 2, 3, 4, 5, 7]...
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