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lines changed Original file line number Diff line number Diff line change @@ -8,22 +8,11 @@ const subtract = function(num1, num2) {
88} ;
99
1010const sum = function ( numArr ) {
11- let sumArr = 0 ;
12- for ( let i = 0 ; i < numArr . length ; i ++ ) {
13- sumArr += numArr [ i ] ;
14- }
15- return sumArr ;
11+ return numArr . reduce ( ( total , num ) => total + num , 0 ) ;
1612} ;
1713
1814const multiply = function ( numArr ) {
19- let product = 1 ;
20- if ( numArr . length === 0 ) {
21- return 0 ;
22- }
23- for ( let i = 0 ; i < numArr . length ; i ++ ) {
24- product *= numArr [ i ] ;
25- }
26- return product ;
15+ return numArr . reduce ( ( total , num ) => total * num , 1 ) ;
2716} ;
2817
2918const power = function ( num1 , num2 ) {
Original file line number Diff line number Diff line change 11const palindromes = function ( string ) {
2- string = string . replace ( / [ . , ! ] / g, "" ) ;
3- string = string . toLowerCase ( ) ;
4- // console.log(string);
5- // string = string.split('');
6- for ( let i = 0 ; i < Math . floor ( string . length / 2 ) ; i ++ ) {
7- // conso
8000
le.log(`${string[i]}\t${string[string.length-i-1]}`)
8- if ( string [ i ] != string [ string . length - 1 - i ] ) {
9- return false ;
10- }
11- }
12- return true ;
2+ processedString = string
3+ . toLowerCase ( )
4+ . replace ( / [ ^ a - z ] / g, "" ) ;
5+
6+ return (
7+ processedString
8+ . split ( "" )
9+ . reverse ( )
10+ . join ( "" ) === processedString
11+ ) ;
1312} ;
1413
1514// Do not edit below this line
Original file line number Diff line number Diff line change 11const getTheTitles = function ( books ) {
2- bookTitles = Array ( ) ;
3- for ( let i = 0 ; i < books . length ; i ++ ) {
4- bookTitles . push ( books [ i ] . title ) ;
5- }
6- return bookTitles ;
2+ return books . map ( book => book . title ) ;
73} ;
84
95// Do not edit below this line
Original file line number Diff line number Diff line change 11const findTheOldest = function ( people ) {
2- const currentYear = parseInt ( new Date ( ) . getFullYear ( ) ) ;
3- let age = Array ( ) ;
4- for ( let i = 0 ; i < people . length ; i ++ ) {
5-<
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/span> if ( people [ i ] . yearOfDeath === undefined ) {
6- age . push ( currentYear - people [ i ] . yearOfBirth ) ;
7- } else {
8- age . push ( people [ i ] . yearOfDeath - people [ i ] . yearOfBirth ) ;
9- }
2+ return people . reduce ( ( oldest , person ) => {
3+ return getAge ( oldest ) > getAge ( person ) ? oldest : person ;
4+ } ) ;
5+ } ;
6+
7+ const getAge = function ( person ) {
8+ if ( person . yearOfDeath === undefined ) {
9+ const currentYear = parseInt ( new Date ( ) . getFullYear ( ) ) ;
10+ return currentYear - person . yearOfBirth ;
11+ } else {
12+ return person . yearOfDeath - person . yearOfBirth ;
1013 }
11- return people [ age . indexOf ( Math . max ( ...age ) ) ] ;
1214} ;
1315
1416// Do not edit below this line
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