Can u explain for me, why do we need to use this library instead of using normal for loop ? i want to know about performance about lo

[ivila]

Maybe you could check about the topic "Functional programming", it should answer your question about why people need this.

[x1unix]

@lamhieo02 it's more convenient to do complex processing in a declarative way using map/filter/reduce/flatmap chains.

Usually, this functionality uses the power of iterators to avoid unnecessary memory allocations, but this library (and JS as well) consumes and returns plain slices which leads to increased memory allocation.

It's possible to implement the same functionality with iterators (example), but as Go (yet) isn't designed with iterators in mind - you'll still need to transform a final result into a slice to use it in code which isn't familiar with iterators.