[Solved] How would you write a painless script for a runtime field age_category that returns "senior" if age ≥ 65, "adult" if age ≥ 18 but less than 65, and "child" otherwise? | Elasticsearch

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How would you write a painless script for a runtime field age_category that returns "senior" if age ≥ 65, "adult" if age ≥ 18 but less than 65, and "child" otherwise?

A"source": "if (doc['age'].value >= 18) { emit('adult') } else if (doc['age'].value >= 65) { emit('senior') } else { emit('child') }"

B"source": "if (doc['age'].value > 65) { emit('senior') } else if (doc['age'].value > 18) { emit('adult') } else { emit('child') }"

C"source": "if (doc['age'].value >= 65) { emit('senior') } else if (doc['age'].value >= 18) { emit('adult') } else { emit('child') }"

D"source": "emit(doc['age'].value >= 65 ? 'senior' : doc['age'].value >= 18 ? 'adult' : 'child')"

Step-by-Step Solution

Solution:

Step 1: Understand the conditions
Return 'senior' if age >= 65, 'adult' if age >= 18 and less than 65, else 'child'.
Step 2: Evaluate options
"source": "if (doc['age'].value >= 65) { emit('senior') } else if (doc['age'].value >= 18) { emit('adult') } else { emit('child') }" correctly checks >= 65 first, then >= 18, then else.
"source": "if (doc['age'].value > 65) { emit('senior') } else if (doc['age'].value > 18) { emit('adult') } else { emit('child') }" uses > instead of >=, which excludes exact 65 and 18.
"source": "if (doc['age'].value >= 18) { emit('adult') } else if (doc['age'].value >= 65) { emit('senior') } else { emit('child') }" checks >= 18 before >= 65, which causes incorrect categorization.
"source": "emit(doc['age'].value >= 65 ? 'senior' : doc['age'].value >= 18 ? 'adult' : 'child')" uses ternary operators correctly but is less readable; however, it is logically correct but not the best for clarity.
Final Answer:
"source": "if (doc['age'].value >= 65) { emit('senior') } else if (doc['age'].value >= 18) { emit('adult') } else { emit('child') }" is the clearest and correct implementation.
Quick Check:
Check order and comparison operators [OK]

Quick Trick: Check comparison operators and condition order [OK]

Common Mistakes:

MISTAKES

Using > instead of >= causing boundary errors
Incorrect order of conditions
Misplacing else blocks

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How would you write a painless script for a runtime field age_category that returns "senior" if age &ge; 65, "adult" if age &ge; 18 but less than 65, and "child" otherwise?

Step 1: Understand the conditions

Step 2: Evaluate options

Final Answer:

Quick Check:

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How would you write a painless script for a runtime field age_category that returns "senior" if age ≥ 65, "adult" if age ≥ 18 but less than 65, and "child" otherwise?