algos.md

Useful Algorithms

Dummy data

let data = [
    { id: 1, name: "a" },
    { id: 2, name: "b" },
    { id: 3, name: "c" },
    { id: 4, name: "d" },
    { id: 5, name: "e" },
];

Shuffle array

function shuffleArray(array) {
    for (var i = array.length - 1; i > 0; i--) {
        var j = Math.floor(Math.random() * (i + 1));
        var temp = array[i];
        array[i] = array[j];
        array[j] = temp;
    }
    return array;
}

let shuffled = shuffleArray(data);
console.log(shuffled);

Sort array

// true desc, false asc
let dynamicSort = function (field, reverse, primer) {
    let key = primer
        ? function (x) {
              return primer(x[field]);
          }
        : function (x) {
              return x[field];
          };

    reverse = !reverse ? 1 : -1;

    return function (a, b) {
        return (a = key(a)), (b = key(b)), reverse * ((a > b) - (b > a));
    };
};

let sorted = data.sort(dynamicSort("id", false));
console.log(sorted);