How to sort a dictionary by an array value contained in the dictionary Swift -

i have dictionary contains arrays elements , want sort 1 of array values. solutions found sorting dictionaries single elements , not arrays. also, didn't understand $0.0 meant? below code example of i'm trying accomplish.

var dict = ["mike": [62, 160], "jim": [72, 210], "tony": [68, 187]]  //i want sort height (array values [0]) highest value lowest. //the output this:  "jim": [72, 210] "tony": [68,187] "mike": [62,160] 

i'm relatively new coding have no idea how approach this.

see, have dictionary sorted:

let dict = ["mike": [62, 160], "jim": [72, 210], "tony": [68, 187]] 

you want sort function isorderedbefore: (self.generator.element, self.generator.element) -> bool if first 1 element should have been higher second one, should put a > b function , on.

let sorteddict = dict.sort { (first: (string, array<int>), second: (string, array<int>)) -> bool in     return first.1[0] > second.1[0] } 

it's same as:

let sorteddict = dict.sort {     return $0.1[0] > $1.1[0] } 

or:

let sorteddict = dict.sort { $0.1[0] > $1.1[0] } 

$0 means function's variable has number 0 , on. $0.0 means got first dictionary field (in case it's name), while $0.1 means it's second dictionary field (an array).