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Rooted by: Get sum of elements of array using Array.reduce function
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  • Code 
    /* Array.reduce(
 * (accumulator, currentValue, currentIndex, array) => {
 * return accumulator + currentValue;
 * },
 * initialValue
 * );
 */
function sumOfElements(arr) { 
  return (arr||[]).reduce((sum, currentValue) => sum + currentValue,0);
}

// Using ES6 Arrow Functions
sumOfElements = arr => (arr||[]).reduce((sum, currentValue) => sum + currentValue,0)
     Test Cases 
    // TODO: Replace examples and use TDD development by writing your own tests

// These are some CW specific test methods available:
//    Test.expect(boolean, [optional] message)
//    Test.assertEquals(actual, expected, [optional] message)
//    Test.assertSimilar(actual, expected, [optional] message)
//    Test.assertNotEquals(actual, expected, [optional] message)

// NodeJS assert is also automatically required for you.
//    assert(true)
//    assert.strictEqual({a: 1}, {a: 1})
//    assert.deepEqual({a: [{b: 1}]}, {a: [{b: 1}]})

// You can also use Chai (http://chaijs.com/) by requiring it yourself
// var expect = require("chai").expect;
// var assert = require("chai").assert;
// require("chai").should();

describe("Solution", function(){
  it("should test for something", function(){
    //Test.assertEquals("actual", "expected", "This is just an example of how you can write your own TDD tests");
    Test.assertEquals(sumOfElements([1,2,3]), 6, "Wrong");
    Test.assertEquals(sumOfElements([1]), 1, "Wrong");
    Test.assertEquals(sumOfElements(), 0, "Wrong");
  });
});
    View Run Output
  • Code
    • /* Array.reduce(
    • * (accumulator, currentValue, currentIndex, array) => {
    • * return accumulator + currentValue;
    • * },
    • * initialValue
    • * );
    • */
    • function sumOfElements(arr) {
    • if(arr==undefined) return 0;
    • return arr.reduce((sum, currentValue) => sum + currentValue,0);
    • }
    • return (arr||[]).reduce((sum, currentValue) => sum + currentValue,0);
    • }
    • // Using ES6 Arrow Functions
    • sumOfElements = arr => (arr||[]).reduce((sum, currentValue) => sum + currentValue,0)