LeetCode/TypeScript/2635.ts

// 2635. Apply Transform Over Each Element in Array


function map(arr: number[], fn: (n: number, i: number) => number): number[] {
    let ret: number[] = [];
    const limit: number = arr.length;
    for ( let i = 0; i < limit; ++i ) {
        ret[i] = fn(arr[i], i);
    }
    return ret;
};

function main() {
    function r(arr: number[], fn: (n: number, i: number) => number, exp: number) {
        console.log(`map([${arr}], ${fn}) = ${map(arr, fn)} | exp: ${exp}`)
    }

    r([1,2,3], function plusone(n) { return n + 1; }, [2,3,4])
    r([1,2,3], function plusI(n, i) { return n + i; }, [1,3,5])
    r([10,20,30], function constant() { return 42; }, [42,42,42])

}

main()