@sebgroup/frontend-tools
Version:
A set of frontend tools
50 lines (48 loc) • 1.9 kB
JavaScript
/**
* Modifies a date by either adding or substracting a certain range
* @param {Date} from {date} the starting date
* @param {number} value {number} the value (amount) you want added or substracted
* @param {"ADD" | "SUBTRACT"} type {ADD | SUBSTRACT} the operation type
* @param {"month" | "day" | "year" | "hours" | "seconds"} range the name of the range to modify, example: "month"
*/
function modifyDate(from, value, type, range) {
if (!from) {
return new Date();
}
else if (from instanceof Date) {
const newDate = new Date(from);
let rangeName = range;
if (range === "day") {
rangeName = "date";
}
else if (range === "year") {
rangeName = "fullYear";
}
rangeName =
rangeName.charAt(0).toUpperCase() +
rangeName.substr(1, rangeName.length - 1);
const getAccessor = `get${rangeName}`;
const currentValue = from[getAccessor] ? from[getAccessor]() : null;
if (currentValue === null) {
console.warn(`Date getAccessor \"${getAccessor}\" from range ${range} does not seem to exist. Provide a valid range as: \"month\" | \"day\" | \"year\" | \"hours\" | \"seconds\"`);
}
let newValue;
switch (type) {
case "ADD":
newValue = currentValue + value;
break;
case "SUBTRACT":
newValue = currentValue - value;
break;
default:
console.warn("value should be 'ADD' or 'SUBTRACT'");
return new Date();
}
const setAccessor = `set${rangeName}`;
newDate[setAccessor] && newDate[setAccessor](newValue);
return newDate;
}
return new Date();
}
export { modifyDate };
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