- Find and print the name(s) of user(s) whose age is greater than 30 in nested object. In javascript
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2.Flatten an array (input: [1,2,[3,4], 5], output: [1,2,3,4,5])
Solution 1: using flat() method:
const arr = [1, 2, [3, 4], 5]; const flattenedArr = arr.flat(); console.log(flattenedArr); // Output: [1, 2, 3, 4, 5] but it will not flatten multiple Levels.
Solution 2: using flat() with Infinity
const arr = [1, 2, [3, 4, [5, 6]], 7]; const flattenedArr = arr.flat(Infinity); console.log(flattenedArr); // Output: [1, 2, 3, 4, 5, 6, 7] Solution 3: using recursion and for loop
function flattenArray(arr) { let result = []; arr.forEach(item => { if (Array.isArray(item)) { result = result.concat(flattenArray(item)); // ---------- OR ------ // result = [...result, ...flattenArray(item)]; } else { result.push(item); } }); return result; } const arr = [1, 2, [3, 4, [5, 6]], 7]; const flattenedArr = flattenArray(arr); console.log(flattenedArr); // Output: [1, 2, 3, 4, 5, 6, 7] Solution 4: using recursion and reduce method
function flattenArray(arr) { return arr.reduce((acc, val) => acc.concat(Array.isArray(val) ? flattenArray(val) : val), []); } const arr = [1, 2, [3, 4, [5, 6]], 7]; const flattenedArr = flattenArray(arr); console.log(flattenedArr); // Output: [1, 2, 3, 4, 5, 6, 7] 📌📌 More Javascript Tricky questions here:
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