This is a job for Reduce!
JavaScript:
const nums = [100, 200, 400, 800, 1600, 3200, 6400, 128000] const given_num = 900 const closestReducer = g => (a, b) => Math.abs(g - a) < Math.abs(g - b) ? a : b nums.reduce(closestReducer(given_num)) //=> 800
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This is a job for Reduce!
JavaScript: