Redis HINCRBYFLOAT command is used to increment the float value of a hash field by the given amount. In a Node.js context, it's commonly utilized in applications where you need to adjust numeric values within a hash, such as:
node_redis library provides the
hincrbyfloat function to perform this operation.
Here's a simple example of incrementing a user's score:
In this code:
hincrbyfloat. The new score is logged to console.
hincrbyfloatwith fields that contain numeric data. If the field does not exist or holds non-numeric data, an error will occur.
hincrbyfloat. If the key or field doesn't exist, Redis will assume it's 0 and perform the operation.
Q: What happens if the hash or field doesn't exist?
A: If either the hash or field do not exist, Redis creates them for you. The initial value is assumed to be 0, so
hincrbyfloat increments from 0.
Q: What precision does HINCRBYFLOAT use?
A: Redis HINCRBYFLOAT uses a double precision floating point number, which provides very high precision and large range of magnitudes.