I am trying to create ONE string from an array of objects family and have them separated by commas except for the last element Mary
const family = [
{Person: {
name: John
}}, {Person: {
name: Mike
}}, {Person: {
name: Link
}}
, {Person: {
name: Mary
}}];
I want the string to be like this
"John, Mike, Link or Mary"
I tried using family.toString() but that gives me "John, Mike, Link, Mary" and doesn't allow me to replace "," with an "OR"
Use pop() to get (and remove) the last name. Then use join() to add the rest.
Thx to @charlietfl for suggesting a check on the number of names to prevent something like: and John.
const family = [
{ Person: { name: "John" } },
{ Person: { name: "Mike" } },
{ Person: { name: "Link" } },
{ Person: { name: "Mary" } }
];
// Get all the names
const names = family.map((x) => x.Person.name);
// Get result based on number of names
let result = '';
if (names.length === 1) {
// Just show the single name
result = names[0];
} else {
// Get last name
const lastName = names.pop();
// Create result
result = names.join(', ') + ' and ' + lastName;
}
// Show output
console.log(result);
"and John"I don't think there's a super-elogant option. Best bet is something like:
function joinWord(arr, sep, finalsep) {
return arr.slice(0,-1).join(sep) + finalsep + arr[arr.length-1];
}
and then
joinWord(family.map(x=>x.person.name), ', ', ' or ');
You could make the invocation a little nicer at the cost of performance and modularity with:
Array.prototype.joinWord = function joinWord(sep, finalsep) {
return this.slice(0,-1).join(sep) + finalsep + this[this.length-1];
}
family.map(x=>x.person.name).joinWord(', ', ' or ')
But this is only a good idea if this is going to come up a lot within your program and your program is never going to be a part of something bigger. It effects every array.
How about
let sp = ' or ';
family.map(x => x.Person.name)
.reduceRight(
(x,y) => {
const r = sp + y + x;
sp = ', ';
return r;
}, '')
.replace(', ', '');
Hope, this question was for the school homework :)
