89 lines
1.7 KiB
JavaScript
89 lines
1.7 KiB
JavaScript
const reverse = (string) => {
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return string.split("").reverse().join("");
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};
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const average = (array) => {
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const reducer = (sum, item) => {
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return sum + item;
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};
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return array.length === 0 ? 0 : array.reduce(reducer, 0) / array.length;
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};
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const listHelper = (posts) => {
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console.log("lol");
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return 1;
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};
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const totalLikes = (posts) => {
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if (!posts) {
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return 0;
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}
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const likeCount = posts
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.map((post) => post.likes)
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.reduce((cum, value) => cum + value, 0);
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return likeCount;
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};
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const favoritePost = (posts) => {
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if (!posts || posts.length === 0) {
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return null;
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}
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const highestLikes = posts.reduce(
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(max, post) => (post.likes > max ? (max = post.likes) : max),
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0
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);
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const favoritePost = posts.find((post) => post.likes == highestLikes);
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return favoritePost;
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};
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const mostPosts = (posts) => {
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if (!posts || posts.length === 0) {
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return null;
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}
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const countMap = posts.reduce((acc, post) => {
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acc[post.author] = (acc[post.author] || 0) + 1;
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return acc;
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}, {});
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const [author, postsCount] = Object.entries(countMap).reduce(
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(max, entry) => (entry[1] > max[1] ? entry : max),
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['', 0]
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);
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return { author, posts: postsCount };
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};
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const mostLikes = (posts) => {
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if (!posts || posts.length === 0) {
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return null;
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}
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const likesMap = posts.reduce((acc, post) => {
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acc[post.author] = (acc[post.author] || 0) + post.likes;
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return acc;
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}, {});
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const [author, likesCount] = Object.entries(likesMap).reduce(
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(max, entry) => (entry[1] > max[1] ? entry : max),
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['', 0]
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);
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return { author, likes: likesCount };
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};
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module.exports = {
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reverse,
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average,
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listHelper,
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totalLikes,
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favoritePost,
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mostPosts,
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mostLikes
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};
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