javascript - How to find a string from array of objects using underscore js? - Stack Overflow

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Hi I'm trying to perform _.find using underscore function. When I tried to execute it, it returns undefined, but all my string search from this object is always there. Please find below my sample data structure:

oArrays = [
  { 
    "c":"ABC", 
    "sc":[
      { "name":"ABC123", "t1":0, "t2":0 },
      { "name":"ABC456", "t1":0, "t2":0 },
      { "name":"ABC789", "t1":0, "t2":0 }
    ] 
  },
  { 
    "c":"BCDEF", 
    "sc":[
      { "name":"JJHS", "t1":0, "t2":0 },
      { "name":"JKHJYH", "t1":0, "t2":0 },
      { "name":"DKJHKJ", "t1":0, "t2":0 }
    ] 
  },
  { 
    "c":"ZYXV", 
    "sc":[
      { "name":"KDSKD", "t1":0, "t2":0 },
      { "name":"PWIFGF", "t1":0, "t2":0 },
      { "name":"WWSD", "t1":0, "t2":0 }
    ] 
  }, 
]

_.find(oArrays, function(item){
   return item.sc.name==="ABC123" ;
});

the above codes doesn't worked, result is undefined.... Is it possible to execute it in one _.find function only?

I tried to used multiple _.map function, it works. But as much as possible I dont want to use it coz it will have too many loops. (sample below)

_.map(oArrays, function(item){
  _.find( item.sc, function( item2 ) {
    return item2.name==="ABC123" ;
  });
});

Ooops, btw I'm executing these codes using sails-controller.

really appreciate any help :)

Thanks in advance!

Hi I'm trying to perform _.find using underscore function. When I tried to execute it, it returns undefined, but all my string search from this object is always there. Please find below my sample data structure:

oArrays = [
  { 
    "c":"ABC", 
    "sc":[
      { "name":"ABC123", "t1":0, "t2":0 },
      { "name":"ABC456", "t1":0, "t2":0 },
      { "name":"ABC789", "t1":0, "t2":0 }
    ] 
  },
  { 
    "c":"BCDEF", 
    "sc":[
      { "name":"JJHS", "t1":0, "t2":0 },
      { "name":"JKHJYH", "t1":0, "t2":0 },
      { "name":"DKJHKJ", "t1":0, "t2":0 }
    ] 
  },
  { 
    "c":"ZYXV", 
    "sc":[
      { "name":"KDSKD", "t1":0, "t2":0 },
      { "name":"PWIFGF", "t1":0, "t2":0 },
      { "name":"WWSD", "t1":0, "t2":0 }
    ] 
  }, 
]

_.find(oArrays, function(item){
   return item.sc.name==="ABC123" ;
});

the above codes doesn't worked, result is undefined.... Is it possible to execute it in one _.find function only?

I tried to used multiple _.map function, it works. But as much as possible I dont want to use it coz it will have too many loops. (sample below)

_.map(oArrays, function(item){
  _.find( item.sc, function( item2 ) {
    return item2.name==="ABC123" ;
  });
});

Ooops, btw I'm executing these codes using sails-controller.

really appreciate any help :)

Thanks in advance!

• javascript
• node.js
• underscore.js
• sails.js

Share Improve this question Follow edited Apr 3, 2015 at 22:54 Travis Webb 15k99 gold badges5959 silver badges111111 bronze badges asked Sep 1, 2014 at 8:07 NinaNina 14122 silver badges1414 bronze badges

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1 Answer 1

Sorted by: Reset to default 4

item.sc.name is never a string, as you're trying to pare it to. In fact, it's actually undefined. But item.sc is an array of objects with the name property.

You have to check if among the name properties there's what you're looking for:

_.find(oArrays, function(item) {
    return _.contains(_.pluck(item.sc, "name"), "ABC123");
});

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