40code-extensions/stats.js at main · 40codeTeam/40code-extensions · GitHub

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class Stats {
  getInfo() {
    return {
      id: 'stats',
      name: '数据分析',
      blocks: [
        {
          opcode: 'average',
          blockType: Scratch.BlockType.REPORTER,
          text: '平均数自 [NUMBERS]',
          arguments: {
            NUMBERS: {
              type: Scratch.ArgumentType.STRING,
              defaultValue: '1 2 3 4 5'
            }
          }
        },
        {
          opcode: 'maximum',
          blockType: Scratch.BlockType.REPORTER,
          text: '最大值自 [NUMBERS]',
          arguments: {
            NUMBERS: {
              type: Scratch.ArgumentType.STRING,
              defaultValue: '1 2 3 4 5'
            }
          }
        },
        {
          opcode: 'minimum',
          blockType: Scratch.BlockType.REPORTER,
          text: '最小值自 [NUMBERS]',
          arguments: {
            NUMBERS: {
              type: Scratch.ArgumentType.STRING,
              defaultValue: '1 2 3 4 5'
            }
          }
        },
        {
          opcode: 'median',
          blockType: Scratch.BlockType.REPORTER,
          text: '中位数自 [NUMBERS]',
          arguments: {
            NUMBERS: {
              type: Scratch.ArgumentType.STRING,
              defaultValue: '1 2 3 4 5'
            }
          }
        },
        {
          opcode: 'mode',
          blockType: Scratch.BlockType.REPORTER,
          text: '众数自 [NUMBERS]',
          arguments: {
            NUMBERS: {
              type: Scratch.ArgumentType.STRING,
              defaultValue: '1 2 2 3 4 5'
            }
          }
        },
        {
          opcode: 'variance',
          blockType: Scratch.BlockType.REPORTER,
          text: '方差自 [NUMBERS]',
          arguments: {
            NUMBERS: {
              type: Scratch.ArgumentType.STRING,
              defaultValue: '1 2 3 4 5'
            }
          }
        }
      ]
    };
  }

  average(args) {
    const numbers = args.NUMBERS.split(' ').map(Number);
    const sum = numbers.reduce((a, b) => a + b, 0);
    return sum / numbers.length;
  }

  maximum(args) {
    const numbers = args.NUMBERS.split(' ').map(Number);
    return Math.max(...numbers);
  }

  minimum(args) {
    const numbers = args.NUMBERS.split(' ').map(Number);
    return Math.min(...numbers);
  }

  median(args) {
    const numbers = args.NUMBERS.split(' ').map(Number);
    const sorted = numbers.sort((a, b) => a - b);
    const middle = Math.floor(sorted.length / 2);
    if (sorted.length % 2 === 0) {
      return (sorted[middle - 1] + sorted[middle]) / 2;
    } else {
      return sorted[middle];
    }
  }

  mode(args) {
    const numbers = args.NUMBERS.split(' ').map(Number);
    const counts = new Map();
    let maxCount = 0;
    let mode = null;
    for (const number of numbers) {
      let count = counts.get(number) || 0;
      count++;
      counts.set(number, count);
      if (count > maxCount) {
        maxCount = count;
        mode = number;
      }
    }
    return mode;
  }

  variance(args) {
    const numbers = args.NUMBERS.split(' ').map(Number);
    const mean = this.average(args);
    const squaredDifferences = numbers.map(x => (x - mean) ** 2);
    const sum = squaredDifferences.reduce((a, b) => a + b, 0);
    return sum / numbers.length;
  }
}

Scratch.extensions.register(new Stats());