freeCodeCamp/finders-keepers.english.md at ba6ae7154c0abf583ec2fb5f33557fd29b5e791f

Randell Dawson 5bf8527523 fix(curriculum): Remove unnecessary assert message argument from English challenges JavaScript Algorithms and Data Structures - 02 (#36402 )

* fix: rm assert msg basic-algorithm-scripting

* fix: rm assert msg debugging

* fix: rm assert msg es6

* fix: rm assert msg functional-programming

2019-07-24 10:47:32 +02:00

1.5 KiB

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id, title, isRequired, challengeType

id	title	isRequired	challengeType
a6e40f1041b06c996f7b2406	Finders Keepers	true	5

Description

Create a function that looks through an array (first argument) and returns the first element in the array that passes a truth test (second argument). If no element passes the test, return undefined. Remember to use Read-Search-Ask if you get stuck. Try to pair program. Write your own code.

Instructions

Tests

tests:
  - text: <code>findElement([1, 3, 5, 8, 9, 10], function(num) { return num % 2 === 0; })</code> should return 8.
    testString: assert.strictEqual(findElement([1, 3, 5, 8, 9, 10], function(num) { return num % 2 === 0; }), 8);
  - text: <code>findElement([1, 3, 5, 9], function(num) { return num % 2 === 0; })</code> should return undefined.
    testString: assert.strictEqual(findElement([1, 3, 5, 9], function(num) { return num % 2 === 0; }), undefined);

Challenge Seed

function findElement(arr, func) {
  let num = 0;
  return num;
}

findElement([1, 2, 3, 4], num => num % 2 === 0);

Solution

function findElement(arr, func) {
  return arr.filter(func)[0];
}

findElement([1, 2, 3, 4], num => num % 2 === 0);

1.5 KiB Raw Blame History