I am trying to get the max value of all the wins properties in an object. Here is a shortened example of the object, of which I am trying to get the max value of the wins props, which would be 11.
var coach_wins = {
"player1": [
{
year: 2015,
wins: 6
},
{
year: 2016,
wins: 6
}
],
"player2": [
{
year: 2015,
wins: 11
},
{
year: 2016,
wins: 6
}
]
};
Currently I am counting the length of the object and then using a for loop to loop through the object and get the keys:
coach_wins[Object.keys(coach_wins)[i]];
then do this again and store the values of each wins value;
Is there a more efficient way?
Thanks.
var coach_wins = { "player1": [ { year: 2015, wins: 6 }, { year: 2016, wins: 6 } ], "player2": [ { year: 2015, wins: 11 }, { year: 2016, wins: 6 } ] }; var max = Object.values(coach_wins) //get all the values of the object .reduce(function(largest, player){ //reduce the max for all player return player.reduce(function(largest, record){ //reduce the max for each player return (largest > record.wins ? largest : record.wins); }, largest); }, 0); console.log(max);
What about this?
Object.values(coach_wins).reduce(
(result, player) => Math.max(result, player.reduce(
(wins, winsPerYear) => Math.max(wins, winsPerYear.wins)
, 0))
, 0); // --> 11
If player's individual arrays will always containing 2 that's fine I guess but if it can be changed you can go to some thing like this. Bit of code but won't put you in exceptions
function getMaxWins(){
var maxWins = 0;
for (var curPlayer in coach_wins) {
//checking whether is it contains records
var playerRecords = coach_wins[curPlayer];
if(playerRecords){
playerRecords.forEach(function (playerRecord_) {
if(maxWins < playerRecord_.wins) maxWins = playerRecord_.wins;
});
}
}
return maxWins;
}
console.log(getMaxWins());
You can try this..
var max = coach_wins[Object.keys(coach_wins)[0]][0].wins;
for (var player in coach_wins ) {
if (coach_wins.hasOwnProperty(player)) {
var current_max = Math.max.apply(Math,coach_wins[player].map(function(o){return o.wins;}));
max = current_max > max ? current_max:max;
}
}
或者,使用功能性方法和ES6语法,您可以
Math.max(...[].concat(...Object.values(coach_wins).map(p=>p.map(g=>g.wins))))
You can define a variable set to 0
, use Object.values()
to iterate values of object, .forEach()
to iterate each array, if value of wins
is greater than variable, set variable to value of "wins"
property
var coach_wins = { "player1": [ { year: 2015, wins: 6 }, { year: 2016, wins: 6 } ], "player2": [ { year: 2015, wins: 11 }, { year: 2016, wins: 6 } ] }; let res; Object.values(coach_wins) .forEach(prop => prop.forEach(({wins}) => { if (!res || wins > res) res = wins }) ); console.log(res)
An expected result object would have been appreciated but I am guessing this is what you are looking for:
var result = {};
for(var player in coach_wins){
result[player] = coach_wins[player].reduce((max, value) => {return value.wins>max?value.wins:max}, 0);
}
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