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Grouping names based on first letter in JavaScript
Suppose, we have an array of names like this −
const arr = ["Simon", "Mike", "Jake", "Lara", "Susi", "Blake", "James"];
We are required to write a JavaScript function that takes in one such array. The function should return an array of objects with two properties −
letter -> the letter on which the names are grouped
names -> an array of names that falls in that group
Example
The code for this will be −
const arr = ["Simon", "Mike", "Jake", "Lara", "Susi", "Blake", "James"];
const groupNames = arr => {
const map = arr.reduce((acc, val) => {
let char = val.charAt(0).toUpperCase();
acc[char] = [].concat((acc[char] || []), val);
return acc;
}, {});
const res = Object.keys(map).map(el => ({
letter: el,
names: map[el]
}));
return res;
};
console.log(groupNames(arr));Output
The output in the console −
[
{ letter: 'S', names: [ 'Simon', 'Susi' ] },
{ letter: 'M', names: [ 'Mike' ] },
{ letter: 'J', names: [ 'Jake', 'James' ] },
{ letter: 'L', names: [ 'Lara' ] },
{ letter: 'B', names: [ 'Blake' ] }
]
Updated on: 10-Oct-2020
1K+ Views
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