Late night playtime with es6 arrow functions

gistfile1.js

var arr = [25,26,29,59,16,1325,3];

var id = (x) => _ => x;
var gt = (b) => a => a > b;
arr.filter(gt(25)); // [26, 29, 59, 132]


var people = [
    {name: "John", age: 45},
    {name: "Fantomas", age: 34},
    {name: "Seppo", age: 59}
    ];

var eq = (fn, target) => _ => fn(_) === target;
var key = key => obj => obj[key];

people.filter(eq(key('name'), 'Seppo')); //[{name: "Seppo", age: 59}]