Let's say I have an array like so:
var array = [{date: "2021-06-02", name: "Foo" /*... and more*/}]
Now i have sorted the array with
array.sort(function (a, b) {
var keyA = new Date(a.date),
keyB = new Date(b.date);
if (keyA < keyB) return -1; // a.date is before b.date
if (keyA > keyB) return 1; // other way around
return 0;
});
And now I want to add {type: "new date occured", date: "", name: "New Date!"} after each new date in the now sorted array.
You can use like following
var array = [{date: "2021-06-02", name: "Foo" }, {date: "2021-06-01", name: "Bar" }, {date: "2021-06-05", name: "Hello" }]
array = array.sort(function (a, b) {
var keyA = new Date(a.date),
keyB = new Date(b.date);
if (keyA < keyB) return -1; // a.date is before b.date
if (keyA > keyB) return 1; // other way around
return 0;
});
console.log(array)
array.push({type: "new date occured", date: "", name: "New Date!"})
console.log(array)
[
{ date: '2021-06-01', name: 'Bar' },
{ date: '2021-06-02', name: 'Foo' },
{ date: '2021-06-05', name: 'Hello' }
]
[
{ date: '2021-06-01', name: 'Bar' },
{ date: '2021-06-02', name: 'Foo' },
{ date: '2021-06-05', name: 'Hello' },
{ type: 'new date occured', date: '', name: 'New Date!' }
]
I think this answers your question, though what you actually want to do is very unclear.
const array = [{date: "2021-06-02", name: "Foo" }, {date: "2021-06-01", name: "Bar" }, {date: "2021-06-05", name: "Hello" }];
function sortFunc(a, b) {
var keyA = new Date(a.date),
keyB = new Date(b.date);
if (keyA < keyB) return -1; // a.date is before b.date
if (keyA > keyB) return 1; // other way around
return 0;
}
array.sort(sortFunc);
console.log(array);
function alterDate(name, newDate) {
const thisDate = array.find(d => d.name === name);
if (!thisDate) return;
thisDate.date = newDate;
thisDate.type = "new date occured";
array.sort(sortFunc);
}
alterDate("Bar", "2021-06-08");
console.log(array);You say "insert after" so here I add one from the date in the array and use that, inserting a new object after the current one for each instance in your array. I created a sample array to show a sample set.
Given some ambiguity of your question this might not be exactly what you desire but should give you a point to work from.
I also took liberty and added a type:'old' to the original array so they all have the same properties - easily removed if you wish just do so.
var myArray = [{
date: "2021-06-02",
name: "Foo"
}, {
date: "2021-06-06",
name: "bar"
}, {
date: "2021-06-12",
name: "fiz"
}, {
date: "2021-02-21",
name: "feb"
}];
function compare(firstEl, secondEl) {
let keyA = new Date(firstEl.date).getTime(),
keyB = new Date(secondEl.date).getTime();
if (keyA < keyB) return -1; // firstEl.date is before secondEl.date
if (keyA > keyB) return 1; // other way around
//equal
return 0;
}
function getNewDate(olddate) {
let nextDay = new Date(olddate);
nextDay.setDate(nextDay.getDate() + 1);
let dateString = nextDay
.toISOString("en-CA")
.split("T")[0];
return dateString;
}
myArray.sort(compare);
// doing this just to show the 'old' with the same set of properties
myArray.forEach(function (element) {
element.type = "old";
});
i = myArray.length - 1;
do {
let replacecount = 0;
let currItem = myArray[i];
let nextDay = getNewDate(currItem.date);
let newvalue = {
type: 'new date occurred',
date: nextDay,
name: "newDate" + i
};
myArray.splice(i+1, 0, newvalue);
} while (i--)
console.log(myArray);
array.push()...after each new date in the now sorted arraywhat is a 'new date'?datekey