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| 1 | +let games = [ |
| 2 | + { name: "Afterparty", price: 125 }, |
| 3 | + { name: "Dauntless", price: 100 }, |
| 4 | + { name: "The Division 2", price: 200 }, |
| 5 | + { name: "Metro Exodus", price: 85 }, |
| 6 | + { name: "Tetris 99", price: 20 }, |
| 7 | + { name: "Wargroove", price: 50 } |
| 8 | +]; |
| 9 | + |
| 10 | +let numbersArr = [1, 2, 3, 4, 5]; |
| 11 | + |
| 12 | +//reduce |
| 13 | +let sumReducer = (accumulator, currentItem) => { |
| 14 | + return { price: accumulator.price + currentItem.price }; |
| 15 | +}; |
| 16 | + |
| 17 | +let expensiveReducer = (accumulator, currentItem) => { |
| 18 | + return { price: Math.max(accumulator.price, currentItem.price) }; |
| 19 | +}; |
| 20 | + |
| 21 | +// let reduceResult = games.reduce(sumReducer); |
| 22 | +// console.log(reduceResult.price); |
| 23 | + |
| 24 | +let reduceResult = games.reduce(expensiveReducer); |
| 25 | +// console.log(reduceResult.price); |
| 26 | + |
| 27 | +//some |
| 28 | +// let someResult = games.some(item => { |
| 29 | +// return item.price < 20; |
| 30 | +// }); |
| 31 | +// console.log(someResult); |
| 32 | + |
| 33 | +//map |
| 34 | +// let gamesPrice = games.map(item => { |
| 35 | +// return { name: item.name, price: item.price * 2 }; |
| 36 | +// }); |
| 37 | + |
| 38 | +// console.log(gamesPrice); |
| 39 | + |
| 40 | +// //keys, values |
| 41 | +// let values = games.values(); |
| 42 | + |
| 43 | +// for (let value of values) { |
| 44 | +// console.log(value); |
| 45 | +// } |
| 46 | + |
| 47 | +//find, findIndex |
| 48 | +// let findResult = games.find(item => { |
| 49 | +// return item.price < 100; |
| 50 | +// }); |
| 51 | +// let findResult = games.findIndex(item => { |
| 52 | +// return item.price == 100; |
| 53 | +// }); |
| 54 | +// console.log(findResult); |
| 55 | + |
| 56 | +//filter |
| 57 | +// let filterResult = games.filter(item => { |
| 58 | +// return item.price > 80; |
| 59 | +// }); |
| 60 | +// console.log(filterResult); |
| 61 | + |
| 62 | +// //every |
| 63 | +// let everyResult = games.every(item => { |
| 64 | +// return item.price > 21; |
| 65 | +// }); |
| 66 | +// console.log(everyResult); |
| 67 | + |
| 68 | +// //forEach |
| 69 | +// numbersArr.forEach(item => { |
| 70 | +// // console.log(item); |
| 71 | +// }); |
| 72 | +// games.forEach(item => { |
| 73 | +// console.log(item); |
| 74 | +// }); |
| 75 | + |
| 76 | +//toString |
| 77 | +// console.log(numbersArr.toString()); |
| 78 | + |
| 79 | +// //join |
| 80 | +// console.log(numbersArr.join("\t")); |
| 81 | + |
| 82 | +//includes |
| 83 | +// console.log(numbersArr.includes(2)); |
| 84 | +// console.log(numbersArr.includes(6)); |
| 85 | + |
| 86 | +//concat |
| 87 | +// let moreNumbers = [6, 7, 8]; |
| 88 | +// console.log(numbersArr.concat(moreNumbers)); |
| 89 | + |
| 90 | +//reverse |
| 91 | +// console.log(numbersArr.reverse()); |
| 92 | + |
| 93 | +//sort |
| 94 | +// console.log(numbersArr.sort()); |
| 95 | + |
| 96 | +//fill(value, start, end) |
| 97 | +// console.log(numbersArr.fill(8, 0, 2)); |
| 98 | + |
| 99 | +//copywithin(target, start, end) |
| 100 | +// console.log(numbersArr.copyWithin(-2)); |
| 101 | + |
| 102 | +//slice(begin, end); |
| 103 | +// let sliceResult = numbersArr.slice(2, -2); |
| 104 | +// console.log(sliceResult); |
| 105 | + |
| 106 | +//splice(start, deleteCount, item1, item2, item3) |
| 107 | +// let spliceResult1 = numbersArr.splice(2, 2, 6, 7, 8, 9, 10); |
| 108 | +// console.log(spliceResult1); |
| 109 | +// console.log(numbersArr); |
| 110 | + |
| 111 | +// //shift |
| 112 | +// let shiftResult = numbersArr.shift(); |
| 113 | +// console.log(shiftResult); |
| 114 | +// console.log(numbersArr); |
| 115 | + |
| 116 | +// //unshift |
| 117 | +// let unshiftResult = numbersArr.unshift(shiftResult); |
| 118 | +// console.log(unshiftResult); |
| 119 | +// console.log(numbersArr); |
| 120 | + |
| 121 | +// //push |
| 122 | +// let pushResult = numbersArr.push(10); |
| 123 | +// // console.log(numbersArr); |
| 124 | +// // console.log(pushResult); |
| 125 | + |
| 126 | +// games.push({ name: "Control", price: 250 }); |
| 127 | +// // console.log(games); |
| 128 | + |
| 129 | +// //pop |
| 130 | +// let popResult1 = numbersArr.pop(); |
| 131 | +// // console.log(popResult1); |
| 132 | +// // console.log(numbersArr); |
| 133 | + |
| 134 | +// let popResult2 = games.pop(); |
| 135 | +// console.log(popResult2); |
| 136 | +// console.log(games); |
| 137 | + |
| 138 | +//indexOf |
| 139 | +// console.log(numbersArr.indexOf(6)); |
| 140 | + |
| 141 | +// console.log(numbersArr[2]); |
| 142 | + |
| 143 | +//length |
| 144 | +// console.log(games.length, numbersArr.length); |
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