Adding Information: Arrays

• What if your document contains arrays?

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  • No problem: use your programming language array syntax

• Are numeric and associative arrays handled differently?

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  • Numeric:
  • Reference elements by number
  • In the MongoDB shell: field:[ value, value ]
  • Associative:
  • Reference elements by label
  • In the MongoDB shell: field:[{label1:value1,label2:value2},{etc.}]

• How do you find info in array fields?

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  • Use find()
  • Numeric arrays: use $in
  • Associative arrays: use array.key syntax