chain functions
lets asume that we have an array of object
and you want to make few operation on the array like
filter , map , sort
so one option will be straightforward
run each time on every operation
const arr = [{ name: itay, age: 10 }, { name: sam, age: 20 }, { name: jett, age: 30 }, { name: bob, age: 40 }] //filter the obkect with age under 10 const filtering = ({ age }) => age > 10 filterdArr = arr.filter(filtering) // abount the sorting - if the function return negetive value then a will be befora b //and if the funtion return positive number then b will be before a const sorting = (a, b) => a.age - b.age sortedArr = filterdArr.sort(sorting) //refactor the object , changed age to myAge const mapping = ({ name, age }) => ({ name, myAge: age }) mapedArr = sortedArr.map(mapping) console.log(mapedArr) the second option will be to chain the funtions
like that
console.log( arr.filter(filtering) .sort(sorting) .map(mapping)) and the result will be the same
[
{ name: 'jett', myAge: 30 },
{ name: 'bob', myAge: 40 },
{ name: 'sam', myAge: 55 }
]
Top comments (0)