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converts a string into an array of numbers
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| const toNumArray = s => s.match(/[\d\.-]+/g).map(p=>Number(p)); |
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uses a really quick and highly functional match to convert anything that resembles a number into an actual number
toNumArray('hsla(270,80%,40.25%,0.7)') //[270, 80, 40.25, 0.7]