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const months = ["January","February","March","April","May","June","July", "August","September","October","November","December"];
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const monthArray = [Array(12).keys()]
.map(i => i).map(x => new Intl.DateTimeFormat("en-US", { month: "long" })
.format((new Date).setMonth(x)));
// monthArray = ['January', 'February', 'March', 'April', 'May', 'June',
//'July', 'August', 'September', 'October', 'November', 'December']
const sortMonthArray = monthArray.map(month => month.slice(0, 3));
// sortMonthArray = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul',
//'Aug', 'Sep', 'Oct', 'Nov', 'Dec']