generateAsciiGraph by GPT4

generateAsciiGraph.js

// Written by GPT4

// Prompt:
// Write a JS function that returns a string of an ASCII graph for a given function string.
// The function string should be the text of an anonymous JS function that returns a single number.
// Use eval to figure out the result of the func.

function generateAsciiGraph(funcStr, width = 50, height = 10, minX = -10, maxX = 10, minY = -10, maxY = 10) {
  const func = eval(funcStr);
  const stepX = (maxX - minX) / width;
  const stepY = (maxY - minY) / height;
  
  function getY(x) {
    return func(x);
  }

  function getX(index) {
    return minX + index * stepX;
  }

  function scaleToAxis(val, axisSize, min, max) {
    return Math.floor(((val - min) / (max - min)) * axisSize);
  }

  let graph = '';

  for (let j = height - 1; j >= 0; j--) {
    for (let i = 0; i < width; i++) {
      const x = getX(i);
      const y = getY(x);
      
      const scaledY = scaleToAxis(y, height, minY, maxY);
      const scaledX = scaleToAxis(x, width, minX, maxX);

      if (scaledY === j) {
        graph += '*';
      } else if (scaledX === i && scaledY === 0) {
        graph += '+';
      } else if (scaledX === i) {
        graph += '-';
      } else if (scaledY === 0) {
        graph += '|';
      } else {
        graph += ' ';
      }
    }
    graph += '\n';
  }

  return graph;
}

const funcStr = "(x) => Math.sin(x)";
console.log(generateAsciiGraph(funcStr));