Custom util to get weekday name or number

#javascript #webdev #codenewbie #beginners

constgetDayNameOrNo=(value)=>{constmappings=[[0,"sunday"],[1,"monday"],[2,"tuesday"],[3,"wednesday"],[4,"thursday"],[5,"friday"],[6,"saturday"],];constmatch=mappings.find(([dayNo,name])=>dayNo===value||name===value);if(!match)return;const[matchedNo,matchedName]=match;returnmatchedNo===value?matchedName:matchedNo;};console.log(getDayNameOrNo(0));// sundayconsole.log(getDayNameOrNo("sunday"));// 0console.log(getDayNameOrNo("friday"));// 5

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Top comments(2)

Ste Griffiths

Do justly, love mercy, code humbly. Following Jesus and flipping bits. #BuildCoolStuffTogether

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• May 26 '21

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Thanks for the post. I think you could improve it by removing the hardcoded English day names and using the JS built-in features to get the day of the week in yourlocale.

Typescript:

getWeekDays(locale):string[]{varbaseDate=newDate(Date.UTC(2017,0,1));// just a SundayvarweekDays=[];for(leti=0;i<7;i++){letdayName=baseDate.toLocaleDateString(locale,{weekday:'long'});dayName=dayName[0].toUpperCase()+dayName.slice(1);weekDays.push(dayName);baseDate.setDate(baseDate.getDate()+1);}returnweekDays;}