Amaps as sets (MIT/GNU Scheme 12.1)

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#### 11.8.8 Amaps as sets

procedure: amap-union! amap1 amap2 ¶

  Adds the associations of amap2 to amap1 and returns amap1. If a key appears in both maps, its value is set to the value appearing in amap1.

procedure: amap-intersection! amap1 amap2 ¶

  Deletes the associations from amap1 whose keys don’t also appear in amap2 and returns amap1.

procedure: amap-difference! amap1 amap2 ¶

  Deletes the associations of amap1 whose keys are also present in amap2 and returns amap1.

procedure: amap-xor! amap1 amap2 ¶

  Deletes the associations of amap1 whose keys are also present in amap2, and then adds the associations of amap2 whose keys are not present in amap1 to amap1. Returns amap1.