Created
November 22, 2017 18:47
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Counts the number of X in an array
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| /** | |
| * @example | |
| * const list = ['a', 'b', 'c', 'c', 'c'] | |
| * const numOfCs = count(list, letter => letter === 'c') | |
| * console.log(numOfCs) // 3 | |
| */ | |
| const count = (ls, cb) => ls.reduce((count, item) => cb(item) ? ++count : count, 0) |
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