// Currying :
//- Currying is an advanced technique of working with functions.
function sum(a) { return function (b) { return function (c) { return function (d) { console.log("sun is:::", a + b + c + d); }; }; };
}
sum(5)(7)(3)(20);

// Reduce in javascript advance
// output: { '22': 2, '24': 2, '26': 1 }
const user = [ {name:"Abhishek",age:24}, {name:"Dhruval",age:22}, {name:"Anish",age:26}, {name:"Aakash",age:22}, {name:"Darshil",age:24},
]
const newUser = user.reduce((acc,cur)=>{ if(acc[cur.age]){ acc[cur.age] = acc[cur.age] +1 } else{ acc[cur.age] = 1 } return acc;
},{})
console.log(newUser)

function frankenSplice(arr1, arr2, n) { // It's alive. It's alive! let localArray = arr2.slice(); for (let i = 0; i < arr1.length; i++) { localArray.splice(n, 0, arr1[i]); n++; } return localArray;
}

function frankenSplice(arr1, arr2, n) { // It's alive. It's alive! let localArr = arr2.slice(); localArr.splice(n, 0, ...arr1); return localArr;
}