3.7 KiB
3.7 KiB
title | id | challengeType |
---|---|---|
Hash from two arrays | 595671d4d2cdc305f0d5b36f | 5 |
Description
Using two Arrays of equal length, create a Hash object where the elements from one array (the keys) are linked to the elements of the other (the values)
Related task: Associative arrays/CreationInstructions
Tests
tests:
- text: <code>arrToObj</code> is a function.
testString: assert(typeof arrToObj === 'function', '<code>arrToObj</code> is a function.');
- text: '<code>arrToObj([1, 2, 3, 4, 5], ["a", "b", "c", "d", "e"])</code> should return <code>{ 1: "a", 2: "b", 3: "c", 4: "d", 5: "e" }</code>'
testString: 'assert.deepEqual(arrToObj(...testCases[0]), res[0], ''<code>arrToObj([1, 2, 3, 4, 5], ["a", "b", "c", "d", "e"])</code> should return <code>{ 1: "a", 2: "b", 3: "c", 4: "d", 5: "e" }</code>'');'
- text: '<code>arrToObj([1, 2, 3, 4, 5], ["a", "b", "c", "d"])</code> should return <code>{ 1: "a", 2: "b", 3: "c", 4: "d", 5: undefined }</code>'
testString: 'assert.deepEqual(arrToObj(...testCases[1]), res[1], ''<code>arrToObj([1, 2, 3, 4, 5], ["a", "b", "c", "d"])</code> should return <code>{ 1: "a", 2: "b", 3: "c", 4: "d", 5: undefined }</code>'');'
- text: '<code>arrToObj([1, 2, 3], ["a", "b", "c", "d", "e"])</code> should return <code>{ 1: "a", 2: "b", 3: "c" }</code>'
testString: 'assert.deepEqual(arrToObj(...testCases[2]), res[2], ''<code>arrToObj([1, 2, 3], ["a", "b", "c", "d", "e"])</code> should return <code>{ 1: "a", 2: "b", 3: "c" }</code>'');'
- text: '<code>arrToObj(["a", "b", "c", "d", "e"], [1, 2, 3, 4, 5])</code> should return <code>{ "a": 1, "b": 2, "c": 3 , "d": 4, "e": 5 }</code>'
testString: 'assert.deepEqual(arrToObj(...testCases[3]), res[3], ''<code>arrToObj(["a", "b", "c", "d", "e"], [1, 2, 3, 4, 5])</code> should return <code>{ "a": 1, "b": 2, "c": 3 , "d": 4, "e": 5 }</code>'');'
- text: '<code>arrToObj(["a", "b", "c", "d", "e"], [1, 2, 3, 4])</code> should return <code>{ "a": 1, "b": 2, "c": 3 , "d": 4, "e": undefined }</code>'
testString: 'assert.deepEqual(arrToObj(...testCases[4]), res[4], ''<code>arrToObj(["a", "b", "c", "d", "e"], [1, 2, 3, 4])</code> should return <code>{ "a": 1, "b": 2, "c": 3 , "d": 4, "e": undefined }</code>'');'
- text: '<code>arrToObj(["a", "b", "c"], [1, 2, 3, 4, 5])</code> should return <code>{ "a": 1, "b": 2, "c": 3 }</code>'
testString: 'assert.deepEqual(arrToObj(...testCases[5]), res[5], ''<code>arrToObj(["a", "b", "c"], [1, 2, 3, 4, 5])</code> should return <code>{ "a": 1, "b": 2, "c": 3 }</code>'');'
Challenge Seed
function arrToObj (keys, vals) {
// Good luck!
return true;
}
After Test
const testCases = [
[[1, 2, 3, 4, 5], ['a', 'b', 'c', 'd', 'e']],
[[1, 2, 3, 4, 5], ['a', 'b', 'c', 'd']],
[[1, 2, 3], ['a', 'b', 'c', 'd', 'e']],
[['a', 'b', 'c', 'd', 'e'], [1, 2, 3, 4, 5]],
[['a', 'b', 'c', 'd', 'e'], [1, 2, 3, 4]],
[['a', 'b', 'c'], [1, 2, 3, 4, 5]]
];
const res = [
{ 1: 'a', 2: 'b', 3: 'c', 4: 'd', 5: 'e' },
{ 1: 'a', 2: 'b', 3: 'c', 4: 'd', 5: undefined },
{ 1: 'a', 2: 'b', 3: 'c' },
{ a: 1, b: 2, c: 3, d: 4, e: 5 },
{ a: 1, b: 2, c: 3, d: 4, e: undefined },
{ a: 1, b: 2, c: 3 }
];
Solution
function arrToObj (keys, vals) {
return keys.reduce((map, key, index) => {
map[key] = vals[index];
return map;
}, {});
}