## factors

``````import _appendǃ from '../_internals/_appendǃ.js'

/**
* @name factors
* @function
* @since v0.8.3
* @category Number
* @sig Number -> Array
* @description Takes a number and builds an array of factors for that number
* @param {Number} x The number it should find the factors of
* @return {Array} A new array which will contain the valid factors of the given number
* @example
* import { factors } from 'kyanite'
*
* factors(36) // => [1, 2, 3, 4, 6, 9, 12, 18, 36]
* factors(-36) // => [1, 2, 3, 4, 6, 9, 12, 18, 36]
* factors(102) // => [1, 2, 3, 6, 17, 34, 51, 102]
* factors(-102) // => [1, 2, 3, 6, 17, 34, 51, 102]
* factors() // => []
* factors(0) // => []
* factors(NaN) // => []
*
* // You can convert the array to negatives with map and negate
* // (Imagining this is a brand new .js file)
* import { compose, factors, map, negate } from 'kyanite'
* map(negate, factors(-36)) // => [-1, -2, -3, -4, -6, -9, -12, -18, -36]
* // Or even cleaner approach:
* const negativeFactors = compose(map(negate), factors)
*
* negativeFactors(-36) // => [-1, -2, -3, -4, -6, -9, -12, -18, -36]
* negativeFactors(36) // => [-1, -2, -3, -4, -6, -9, -12, -18, -36]
*/

const factors = (x = 0) => {
const factors = []
let quotient = 0

for (let i = 1; i <= x; i++) {
quotient = x / i

if (quotient === Math.floor(quotient)) {
_appendǃ(factors, i)
}
}

return factors
}

export default factors
``````