Created
November 18, 2019 04:25
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Use a Frequency Counter Pattern to Check for Duplicates in Javascript Array
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| /** | |
| * Implement a function called hasDuplicates which accepts | |
| * a variable number of integer arguments and returns | |
| * true if there are duplicates in the arguments. | |
| * | |
| * Should be solved in O(n) or better. | |
| * | |
| */ | |
| function hasDuplicates(...args) { | |
| const o = {}; | |
| for (let num of args) { | |
| if (o[num]) return true; | |
| else o[num] = true; | |
| } | |
| return false; | |
| } | |
| console.log(hasDuplicates(1, 2, 3, 4, 5, 6) === false); | |
| console.log(hasDuplicates(-1, -2, -3, -4, 4, 5, 6) === false); | |
| console.log(hasDuplicates(1, 2, 3, 4, 5, 6, 6) === true); | |
| console.log(hasDuplicates(1, 1, 1, 2, 3, 4, 5, 6) === true); |
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