Is there a way to use the filter function to find an object in an array of objects with a property of the object having the highest or lowest value in the array?
So if I have the follow:
var items = [
{"id" : "1", "xpos":123, "ypos" : 321},
{"id" : "2", "xpos":456, "ypos" : 654},
{"id" : "3", "xpos":789, "ypos" : 987}
]
I was wondering if you could use the filter command to find the item with the highest or lower xpos or ypos?
Here is my solution
http://jsfiddle.net/7GCu7/131/
var xpos = [];
var ypos = [];
var items = [
{"id" : "1", "xpos":123, "ypos" : 321},
{"id" : "2", "xpos":456, "ypos" : 654},
{"id" : "3", "xpos":789, "ypos" : 987}
];
$.each(items, function(key, value){
xpos.push(value.xpos);
ypos.push(value.ypos);
});
console.log('heighest xpos:' + Math.max.apply(Math, xpos));
console.log('heighest ypos:' + Math.max.apply(Math, ypos));
Came up with a better solution. This will give you a variable containing the entire object, rather than just the number.
http://jsfiddle.net/7GCu7/132/
var xposObj = {"id":"0", "xpos":0, "ypos":0};
var yposObj = {"id":"0", "xpos":0, "ypos":0};
var items = [
{"id" : "1", "xpos":123, "ypos" : 321},
{"id" : "2", "xpos":456, "ypos" : 654},
{"id" : "3", "xpos":789, "ypos" : 987}
];
$.each(items, function(key, value){
if(value.xpos > xposObj.xpos) xposObj = value;
if(value.ypos > yposObj.ypos) yposObj = value;
});
console.log(xposObj);
console.log(yposObj);
I'm not sure if you can do it with jQuery but the following JavaScript works:
var items = [
{"id" : "1", "xpos":123, "ypos" : 321},
{"id" : "2", "xpos":456, "ypos" : 654},
{"id" : "3", "xpos":789, "ypos" : 987}
]
var findMax = function(pos,object)
{
var max = 0;
for (var key in object) {
if (object.hasOwnProperty(key)) {
if(object[key][pos] > max)
{
max = object[key][pos];
}
}
}
return max;
}
console.log( findMax("xpos",items ));
console.log( findMax("ypos",items ));
This questions is old but just wanted to post another solution using an Array prototype:
Array.prototype.getItem = function ( key, lowest ) {
return ( this.sort( function ( a, b ) { return ( lowest ? a[ key ] - b[key] : b[ key ] - a[key] ) } )[0] )
}
var items = [
{"id" : "1", "xpos":123, "ypos" : 321},
{"id" : "2", "xpos":456, "ypos" : 654},
{"id" : "3", "xpos":789, "ypos" : 987}
];
item.getItem( 'xpos' ); // {"id" : "3", "xpos":789, "ypos" : 987}
item.getItem( 'xpos', true ); // {"id" : "1", "xpos":123, "ypos" : 321}
Hope this helps!
