How do I transpose a matrix?

• 0
  There is an array of any length, but the arrays inside it will always have the same length. For example
  const arr1 = [['a', 'b'], ['1', '2'], ['+', '-']]
  or
  

  const arr2 = [['a', 'b', 'c'], ['1', '2', '3'], ['+', '-', '*']]

  
  It is necessary to make the function accept this array arr1 or arr2 at the input, and the result is the following for arr1:
  const result = [['a', '1', '+'], ['b', '2', '-']]
  or respectively for arr2:
  

  const result = [['a', '1', '+'], ['b', '2', '-'], ['c', '3', '*']]

  JavaScript Adrian Payne, Nov 18, 2019

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2 Answers
• 0

  const transpose = matrix => [...Array(matrix[0].length)].map((_, i) => matrix.map(n => n[i]));

  Anonymous

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• 0

  const pivot = a=>a.reduce((c,e,i)=>(e.forEach((n,j)=>c[j][i]=n),c),a[0].map(z=>[]));

  
  
  

  Eden Hawkins

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