JS Practice — Built-in Objects

Array.prototype.forEach() — collect property values

📖 Usage Example

const result = {}
['a', 'b', 'c'].forEach((v, i) => { result[i] = v })
// result → {0:'a', 1:'b', 2:'c'}

Use forEach() to build an object or other data structure by iterating over array elements.

Array.prototype.forEach() — collecting values

forEach can be used to collect property values from an array of objects into a new array.

Challenge: Implement collectStrings(items) that uses forEach to collect all label values into a string array.

collectStrings([{label:'a'},{label:'b'}]) // → ['a', 'b']
collectStrings([])                         // → []

💡 Hints (2)