How would you chain RxJS operators in Angular to triple each number, then only keep those divisible by 5, and finally convert them to boolean values indicating if they are greater than 20?

hard🚀 Application Q9 of 15

Angular - RxJS Operators

Apipe(filter(x => x % 5 === 0), map(x => x * 3), map(x => x > 20))

Bpipe(map(x => x * 3), filter(x => x % 5 === 0), map(x => x > 20))

Cpipe(map(x => x > 20), filter(x => x % 5 === 0), map(x => x * 3))

Dpipe(map(x => x * 3), map(x => x > 20), filter(x => x % 5 === 0))

Step-by-Step Solution

Solution:

Step 1: Triple each number
Use map(x => x * 3) first to multiply values.
Step 2: Filter divisible by 5
Use filter(x => x % 5 === 0) to keep only multiples of 5.
Step 3: Convert to boolean
Use map(x => x > 20) to convert numbers to booleans.
Final Answer:
pipe(map(x => x * 3), filter(x => x % 5 === 0), map(x => x > 20)) -> Option B
Quick Check:
Order matters: map, filter, then map [OK]

Quick Trick: Transform, filter, then map to final form [OK]

Common Mistakes:

MISTAKES

Filtering before transforming values
Mapping to boolean before filtering
Incorrect operator order

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How would you chain RxJS operators in Angular to triple each number, then only keep those divisible by 5, and finally convert them to boolean values indicating if they are greater than 20?

Step 1: Triple each number

Step 2: Filter divisible by 5

Step 3: Convert to boolean

Final Answer:

Quick Check:

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