Combine enum values to retrieve corresponding enum strings.
Consider the following scenario:
enum EnumDays {
NONE = 0,
SUN = 1,
MON = 2,
TUE = 4,
WED = 8,
THU = 16,
FRI = 32,
SAT = 64,
ALL = 127
}
If I pass a value of 5, which represents SUN & TUE (1 + 4 = 5).
I intend to receive "SUN" & "TUE" as the output. How can this be achieved?
To tackle this task, one method is to iterate through the bits or enum members. The bit iteration approach appears more streamlined. Here, we exploit the fact that EnumDays links values to keys (for example, 1 corresponds to SUN) and keys to values (SUN corresponds to 1). It's worth noting that this method may not identify an enum value of 2147483648. Using 1 << 31, resulting in -2147483648, will provide a solution.
function getDayNames(value: EnumDays) {
let names = [];
for (let bit = 1; bit != 0; bit <<= 1) {
if ((value & bit) != 0 && bit in EnumDays) {
names.push(EnumDays[bit]);
}
}
return names;
}
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