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PascalTriangle.js

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const addRow = (triangle) => {

const previous = triangle[triangle.length - 1]

const newRow = [1]

for (let i = 0; i < previous.length - 1; i++) {

const current = previous[i]

const next = previous[i + 1]

newRow.push(current + next)

}

newRow.push(1)

return triangle.push(newRow)

}

const generate = (numRows) => {

const triangle = [[1], [1, 1]]

if (numRows === 0) {

return []

} else if (numRows === 1) {

return [[1]]

} else {

for (let i = 2; i < numRows; i++) {

addRow(triangle)

}

return triangle

}

export { generate }