Top "Reduce" questions

array.push is not a function - when working with reduce

Can someone please help me understand whats going on here? let firstArray = []; firstArray.push(1); firstArray.push(1); firstArray.push(1); console.log("…

javascript arrays ecmascript-6 reduce

pickle cython class

I have to save and load a cython class instance. My cython class is this plus several methods: import numpy …

python class pickle cython reduce

Java stream merge or reduce duplicate objects

I need to generate a unique friend list from a list that can have duplicates by merging all duplicate entries …

java list merge java-stream reduce

How to call reduce on an empty Kotlin array?

Simple reduce on an empty array will throw: Exception in thread "main" java.lang.UnsupportedOperationException: Empty iterable can't be reduced. …

reduce kotlin

In Stream reduce method, must the identity always be 0 for sum and 1 for multiplication?

I proceed with java 8 learning. I have found an interesting behavior: let's see code sample: // identity value and accumulator and …

java java-8 java-stream reduce

Angular 2 pipe - calculating summary of array of objects

I have list of objects with balances (there are other properties in objects but not imported for example): [{ balance : 100 },{ balance : 200 },{ …

arrays angular sum pipe reduce

Does R have something equivalent to reduce() in Python?

That is : "Apply function of two arguments cumulatively to the items of sequence, from left to right, so as to …

r functional-programming reduce

How to use javascript reduce function to calculate average of items meeting a specific condition?

So assume I have the following array of objects: var arr = [ {"name": "John", "score": "8.8"}, {"name": "John", "score": "8.6"}, {"name": "John", "score": "9.0"}, {"…

javascript reduce