platypusrex

{
  "hello": "world"
}

platypusrex

<ul>
  <li>Item 1
    <ul>
      <li>Item 1.1
        <ul>
          <li>Item 1.1.1</li>
          <li>Item #1.1.2
            <ul>
              <li>Item 1.1.2.1</li>
            </ul>

platypusrex

const findOdd = (arr) => arr.reduce((a,b) => a ^ b);

findOdd([1,1,2,-2,5,2,4,4,-1,-2,5])

platypusrex

function end(str, target) {
  return str.substr(str.length - target.length) === target ? true : false;
}

end('platypus', 's');
end('I\'m pretty sure this thing is on', 'on');

platypusrex

function largest(arr) {
	return arr.map(function(val){
    	return val.reduce(function(prev, current){
        	return current > prev ? current : prev;
        });
    });
}

console.log(largest([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]]));

platypusrex

function titleCase(str) {
  return str.split(' ').map(function(val){
  	return val.charAt(0).toUpperCase() + val.slice(1).toLowerCase();
    }).join(' ');
}

titleCase("sHoRt AnD sToUt");

platypusrex

function diff(arr1, arr2) {
  return newArr = arr1.filter(function(val){
    return arr2.indexOf(val) === -1;
  }).concat(arr2.filter(function(val){
    return arr1.indexOf(val) === -1;
  }));
}

diff(['diorite', 'andesite', 'grass', 'dirt', 'pink wool', 'dead shrub'], ['diorite', 'andesite', 'grass', 'dirt', 'dead shrub']);

platypusrex

function unite(arr1, arr2, arr3) {
   return Array.from(arguments).reduce(function(a, b){
  	return a.concat(b).filter(function(val,pos,arr){
      return arr.indexOf(val) === pos;
    });
  });
}

unite([1, 2, 3], [5, 2, 1, 4], [2, 1], [6, 7, 8]);

platypusrex

function steamroller(arr) {
  // I'm a steamroller, baby
  arr = Array.prototype.concat.apply([], arr);
  return arr.some(Array.isArray) ? steamroller(arr) : arr;
}

steamroller([1, [2], [3, [[4]]]]);

platypusrex

function sumPrimes(num) {
  return Array.apply(0, Array(num + 1))
    .map(function(x, y){
      return y 
  }).filter(function (i){
      return (i > 1) && Array
          .apply(0, Array(1 + ~~Math.sqrt(i)))
      .every(function(x, y){ 			
          	return (y < 2) || (i % y !== 0) 
      });