taks till 'blue belt' done

hw4/script.js

@@ -182,4 +182,87 @@ for(let i = 0; i < 10; i++) {
     }
     numbers += '\n'
 }
-console.log(numbers)
+console.log(numbers)
+
+//chess
+let height = 3
+let width = 12
+let chessboard = ''
+for(let i = 0; i < height; i++) {
+    for(let j = 0; j < width; j++) {
+        i % 2 === 0? (j % 2 === 0? chessboard+='.' : chessboard+='#') : (j % 2 === 0? chessboard +='#' : chessboard+='.')
+    }
+    chessboard += '\n'
+}
+console.log(chessboard)
+
+//cubes
+let cubes = new Array(10)
+for(let i = 0; i < cubes.length; i++) { cubes[i] = i**3 }
+console.log(cubes)
+
+//multiply table
+let mulTable = []
+for(let i = 0; i < 10; i++) {
+    let innerArr = []
+    for(let j = 0; j < 10; j++) {
+        innerArr.push(i * j)
+    }
+    mulTable[i] = innerArr
+}
+console.log(mulTable[5][6]) //будет 30 (но есть нулевые елементы в массиве)
+
+//matrix to html table
+let tableStr = ''
+let colors = ['red', 'orange', 'yellow', 'green', 'skyblue', 'blue', 'purple', 'red', 'orange']
+let prevColors = []
+tableStr += '<table>'
+for (let i = 1; i < mulTable.length; i++) {
+    tableStr += `<tr>`
+    prevColors.push(colors[i - 1])
+    for (let j = 1; j < mulTable.length; j++) {
+        tableStr += `<td 
+                        style="text-align: center;
+                                color: white;
+                                text-shadow: 1px 1px 2px black;
+                                background-color: ${j >= prevColors.length? prevColors[i-1] : prevColors[j-1]}";"
+                    >&nbsp${mulTable[i][j]}&nbsp</td>`
+    }
+    tableStr += '</tr>'
+}
+tableStr += '</table>'
+document.write(tableStr)
+
+//blue belt
+let trigon = ''
+for(let i = 6, step = 1; i > 0; i--) {
+    let repeats = 10
+    for(let j = 0; j <= repeats; j++) {
+        if(j === i - 1) {
+            repeats = repeats - step + 1
+            for(let k = 0; k < step; k++) {
+                trigon += '#'
+            }
+
+        } else {
+            trigon += '.'
+        }
+    }
+    trigon += '\n'
+    step += 2
+}
+console.log(trigon)
+
+// //blacke belt 
+// let history = [1, 1, 1, 1]
+// let predictArray[1][1][1][1] = 0
+
+// while(true) {
+//     let variant = +prompt('input 1 or 0') || alert('wrong input!')
+
+//     if(+variant === 1 || +variant === 0) {
+        
+//         history.shift()
+//         history.push(variant)
+//     }
+// }