How to find the maximum value in JSON array which also contains some JSON array

Question

Please find the below array JSON Object.

points:[{x:1, YValues:[34,45,56]}, {x:5, YValues:[20,12,30]}, {x:8, YValues:[12,13]}]

I want to find the maximum value of X and find the maximum value of YValues separately.

I don't expect for loop to find the maximum value. Expecting in simple way to find the maximum of X as well as maximum of YValues from points JSON object.

Is it possible to use Math.max or any custom function ?

Thanks, Siva

what you have tried ?

rab
– rab

2013-06-08 06:51:26 +00:00
Commented Jun 8, 2013 at 6:51 — rab
– rab, Commented Jun 8, 2013 at 6:51

elclanrs · Accepted Answer · 2013-06-08 07:00:49Z

2

Something like this?

Math.max.apply(0,points.map(function(v){return v.x}));

Still a loop, but it's succinct.

Here's how to do it for YValues. A long line though:

Math.max.apply(0,[].concat.apply([],arr.map(function(v){return v.YValues})));

edited Jun 8, 2013 at 7:00

answered Jun 8, 2013 at 6:55

elclanrs

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9 Comments

SivaRajini Over a year ago

whether it will return only maximum of X. how can i find maximum of YValues

elclanrs Over a year ago

See my edit. It becomes a bit unreadable tho, you might want to create separate variables or a little function.

SivaRajini Over a year ago

thanks but i want only maximum of YValues[1] and X ? not whole YValues array.select all YValues[1] and find maximum and minmum as well

SivaRajini Over a year ago

Math.max.apply(0,points.map(function(v){return v.x})); -> it returns Nan

SivaRajini Over a year ago

sorry elclanrs. working fine. excellent solution. thank you very much

|

rab · Accepted Answer · 2013-06-08 08:39:08Z

1

I made soultion using javascript 1.8 Array reduce method . Please note it works only in modern browsers

var max = yourObj.points.reduce( function ( a, b ){
    a.x = Math.max.apply( 0, [a.x,b.x] ) ;
    a.y = Math.max.apply( 0, [].concat( [ a.y ], b.YValues ) )
    return a;
}, { x :0, y :0 } );

the max variable contains maximum x and y

console.log( max.x );
console.log( max.y );

edited Jun 8, 2013 at 8:39

answered Jun 8, 2013 at 7:26

rab

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