I have an array of strings e.g. const array1 = ["124542", "112244", "112245", "112246"];
I want to create below results:
const array2 = [
{
"comparableId": "124542",
"comparatorId": "112244"
},
{
"comparableId": "112244",
"comparatorId": "112245"
},
{
"comparableId": "112245",
"comparatorId": "112246"
}
]
In this array2, 1st index value from array1 is with 2nd value, 2nd value with 3rd and 3rd with 4th and so on. This array1 is dynamic and can have just 1 value e.g. const array1 = ["124542"]; and can have any number of values.
I have tried using Ecma Script reduce and map methods.
const array2 = array1.map((value, index) => {
return {
comparableId: value,
comparatorId: array1[index + 1] || '',
};
});
Is there some other good way to do it ?
Using a for loop is probably the easiest here.
const array1 = ["124542", "112244", "112245", "112246"];
const transform = (array) => {
const result = [];
for (let i = 0; i === 0 || i < array.length - 1; ++i) {
result.push({
comparableId: array[i],
comparatorId: array[i + 1] ?? "",
})
}
return result;
};
console.log(transform(array1));
console.log(transform(["124542"]));const array1 = ["124542", "112244", "112245", "112246"];
let array2 = [];
array1.map((item, index) =>{
array2.push({comparableId: item, comparatorId: array1[index+1] || ""})
})
console.log(array2)Fully declarative, no mutations solution.
const
array1 = ["124542", "112244", "112245", "112246"],
array2 = [...Array(Math.ceil(array1.length / 2))].map((_, i) =>
({comparableId: array1[i * 2], comparatorId: array1[i * 2 + 1] ?? ""})
);
console.log(array2);