contra-find

Using contra, asynchronously find a value in a collection that matches a condition.

var λ = require('contra');
var find = require('contra-find');
 
var items = [
  [1, 2],
  [2, 3],
  [3, 4],
  [4, 5],
  [5, 6]
];
 
find(λ, items, function(item, next){
 
  console.log('item :', item);
 
  process.nextTick(function(){
    console.log('check:', item);
    next(undefined, item[0] === 3);
  });
 
}, function(err, item){
  console.log('item found!', item);
});

output

item : [ 1, 2 ]
check: [ 1, 2 ]
item : [ 2, 3 ]
check: [ 2, 3 ]
item : [ 3, 4 ]
check: [ 3, 4 ]
item found! [ 3, 4 ]

Notice that it iterates in series and stops as soon as the item is found.

License

MIT