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Add Pascal's triangle. #149

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Merged
merged 3 commits into from
May 5, 2020
Merged

Add Pascal's triangle. #149

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efed033
Add Pascal's triangle.
NourBc May 5, 2020
c5a4c05
Update pascalTriangle.js
NourBc May 5, 2020
34ee21d
Update pascalTriangle.js
itsvinayak May 5, 2020
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Add Pascal's triangle.
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@NourBc
NourBc authored May 5, 2020
commit efed033499db49c5bb592b508c4d96832bff9ae7
16 changes: 16 additions & 0 deletions maths/pascalTriangle.js
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/**
* @param {number} lineNumber - zero based.
* @return {number[]}
*/
export default function pascalTriangle(lineNumber) {
const currentLine = [1];

const currentLineSize = lineNumber + 1;

for (let numIndex = 1; numIndex < currentLineSize; numIndex += 1) {
// See explanation of this formula in README.
currentLine[numIndex] = currentLine[numIndex - 1] * (lineNumber - numIndex + 1) / numIndex;
}

return currentLine;
}