Imagine having two arrays defined like this:
const A = ['Mo', 'Tu', 'We', 'Thu', 'Fr']
const B = ['Mo', 'Mo', 'Mo', 'Tu', 'Thu', 'Fr', 'Sa']
The goal here is to subtract the elements in array A from array B. The expected result should be:
const result = ['Mo', 'Mo', 'Sa']
What is the best way to achieve this task? It may seem straightforward, but I'm having trouble making it work.
Essentially, the desired outcome is to remove all elements from B that are also present in A.
const A = ['Mo', 'Tu', 'We', 'Thu', 'Fr']
const B = ['Mo', 'Mo', 'Mo', 'Tu', 'Thu', 'Fr', 'Sa']
console.log(A.reduce((b, a)=>
(b.includes(a) && b.splice(b.indexOf(a),1), b), [...B]))Providing the solution without utilizing code golf:
const A = ['Mo', 'Tu', 'We', 'Thu', 'Fr']
const B = ['Mo', 'Mo', 'Mo', 'Tu', 'Thu', 'Fr', 'Sa']
console.log(A.reduce((b, a)=> {
if(b.includes(a)) b.splice(b.indexOf(a), 1); return b; }, [...B]))An amusing little twist on filtering a map of A.
const A = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri']
const B = ['Mon', 'Mon', 'Mon', 'Tue', 'Thu', 'Fri', 'Sat']
const aMap = A.reduce((accumulator, current) => (accumulator[current] = (accumulator[current] ?? 0) + 1, accumulator), {})
const result = B.filter(item => !(aMap[item]-- > 0))
console.log(result)def check_days_in_week(day1, day2):
days = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']
if day1 in days and day2 in days:
return True
else:
return FalseGive this a shot:
const X = ['Jan', 'Feb', 'Mar', 'Apr', 'May']
const Y = ['Jan', 'Feb', 'Mar', 'Mar', 'Apr', 'May', 'Jun']
let result = Y;
X.forEach(value => {
for(let index = 0; index < result.length; index++) {
if(result[index] === value) {
result.splice(result.indexOf(value), 1);
break;
}
}
});
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