Determine string occurrence in JSON array

Question

I have a stringified array:

JSON.stringify(arr) = [{"x":9.308,"y":6.576,"color":"yellow","restitution":0.2,"type":"static","radius":1,"shape":"square","width":0.25,"height":0.25},{"x":9.42,"y":7.488,"color":"yellow","restitution":0.2,"type":"static","radius":1,"shape":"square","width":0.25,"height":0.25}]

I need to find out how many times the word yellow occurs so I can do something like:

numYellow = 0;
for(var i=0;i<arr.length;i++){
  if(arr[i] === "yellow")
  numYellow++;
}

doSomething = function() {
  If (numYellow < 100) {
    //do something
  }
  If(numYellow > 100) {
    //do something else
  } else { do yet another thing} 
  }

What does .stringify() have to do with this? If it's really stringified, it can't be iterated like you're doing. — Blue Skies
– Blue Skies, Commented Nov 13, 2013 at 15:35
You can do it without stringify the array. See @Ashwins answer. — jazZRo
– jazZRo, Commented Nov 13, 2013 at 15:37

Explosion Pills · Accepted Answer · 2013-11-13 15:28:47Z

1

Each element of the array is an object. Change arr[i] to arr[i].color. This does assume that the .color property is the only spot where yellow will exist, though.

answered Nov 13, 2013 at 15:28

Explosion Pills

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Ashwin Balamohan · Accepted Answer · 2013-11-13 15:32:40Z

1

This should do the trick:

var array = [{"x":9.308,"y":6.576,"color":"yellow","restitution":0.2,"type":"static","radius":1,"shape":"square","width":0.25,"height":0.25},{"x":9.42,"y":7.488,"color":"yellow","restitution":0.2,"type":"static","radius":1,"shape":"square","width":0.25,"height":0.25}]

var numYellow = 0;

for(var i=0; i<array.length; i++) {
    if (array[i].color === "yellow") {
        numYellow++;
    }
}

answered Nov 13, 2013 at 15:32

Ashwin Balamohan

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