What is the most efficient way to loop on properties in array of objects?

Question

Is there a way I can achieve this code in a more efficient way ? because looping on a very big scores array just to find one score property is very costly

var scores = [{scoredBy:"youssef",score:5},{scoredBy:"omar",score:3}];

scores.forEach(score=>{
    if(score.scoredBy == "youssef"){
      console.log(score);
    }
})

@Teemu Adding a return statement in the conditional should be enough — Sebastianb
– Sebastianb, Commented Jun 13, 2017 at 12:11

epascarello · Accepted Answer · 2017-06-13 12:22:52Z

2

Most efficient way would be to use an object instead of an array where the key is the scoredBy value. No looping, just a lookup.

var scores = { "youssef" : 5, "omar":3 };
console.log(scores["youssef"])

Other ways

var scores = [{scoredBy:"youssef",score:5},{scoredBy:"omar",score:3}];

for (const value of scores) {
  if (value.scoredBy==="youssef") {
    console.log(value.score);
    break;
  }
}

var scores = [{scoredBy:"youssef",score:5},{scoredBy:"omar",score:3}];

var result = scores.find( value => value.scoredBy==="youssef")
console.log(result.score);

edited Jun 13, 2017 at 12:22

answered Jun 13, 2017 at 12:17

epascarello

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