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var sidekicks = [
    { name: "Robin",     hero: "Batman"   },
    { name: "Supergirl", hero: "Superman" },
    { name: "Oracle",    hero: "Batman"   },
    { name: "Krypto",    hero: "Superman" }
];

var batKicks = sidekicks.filter(function (el) {
    return (el.hero === "Batman");
});

// Outputs: [
//    { name: "Robin",  hero: "Batman"   },
//    { name: "Oracle", hero: "Batman"   }
// ]
console.log(batKicks);

var superKicks = sidekicks.filter(function (el) {
    return (el.hero === "Superman");
});

// Outputs: [
//    { name: "Supergirl", hero: "Superman" },
//    { name: "Krypto",    hero: "Superman" }
// ]
console.log(superKicks);

//http://adripofjavascript.com/blog/drips/filtering-arrays-with-array-filter.html

// https://unicode-table.com/en

arr = $$('.unicode_table li.symb')
	.map(u=>{ return [u.outerText, eval(String('\'\\u{'+u.title.split(" ")[0].split("+")[1]+'}\'')), u.title.split(" ")[0]]})
  	.filter(function (el, index, arr) { return el[0]==el[1] });

let taskTitles = tasks.map((task, index, origArray) => {
   return {
     name: task.name
   }
});
console.log(taskTitles);

function removeDuplicates(arr){
    let unique_array = []
    for(let i = 0;i < arr.length; i++){
        if(unique_array.indexOf(arr[i]) == -1){
            unique_array.push(arr[i])
        }
    }
    return unique_array
}

function removeDuplicateUsingFilter(arr){
    let unique_array = arr.filter(function(elem, index, self) {
        return index == self.indexOf(elem);
    });
    return unique_array
}

function removeDuplicateUsingSet(arr){
    let unique_array = Array.from(new Set(arr))
    return unique_array
}

// https://codehandbook.org/how-to-remove-duplicates-from-javascript-array/

var filtered = array.filter(Boolean);

var filtered = array.filter(function (el, index, arr) {
    // Filtering here
});

// display none
$$('figure a').forEach((e)=>{e.style.display='none'})
$$('figure a[class^="styled__ImageWrapper"]').forEach((e)=>{e.style.display='none'})


// How to filter an array from all elements of another array
var exclude_arr=["images","out",".hidden",".DS_Store","pages.js"]
files = files.filter(e => exclude_arr.indexOf(e) < 0 & e.indexOf(".")>1);