Javascript Equivalent of Python's operator.add

Question

Does javascript have an equivalent to Python's operator.add, or any other binary operators?

In Python:

from operator import add
from functools import reduce

# prints 15, requires defining the addition operator
print(reduce(lambda a, b: a + b, [1, 2, 3, 4, 5]))

# prints 15, does not require defining the addition operator
print(reduce(add, [1, 2, 3, 4, 5]))

In Javascript:

// prints 15, requires defining the addition operator
console.log([1, 2, 3, 4, 5].reduce((a,b) => a + b))

// is there a way to do this without defining the addition operator?
console.log([1, 2, 3, 4, 5].reduce(???)

Matt Morgan · Accepted Answer · 2018-11-22 20:53:02Z

1

The way you have done it is the most concise way that I'm aware of in JavaScript. You might want to supply a default value for your reduce to protect against an empty input array:

console.log([1,2,3,4,5].reduce((a,b) => a + b, 0))

// throws a TypeError...
console.log([].reduce((a,b) => a + b))

answered Nov 22, 2018 at 20:53

Matt Morgan

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dun32 · Accepted Answer · 2018-11-22 20:50:42Z

0

Javascript is a low level language : no way until you define it.

See Array.prototype.reduce

const add = (acc, item) => {
    return acc = acc + item;
});

console.log([1, 2, 3, 4, 5].reduce(add, 0));

answered Nov 22, 2018 at 20:50

dun32

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1 Comment

Matt Morgan Over a year ago

JavaScript does not have a built-in function to add an array of numbers, but it's hardly a low-level language. That means something specific in computer science. en.wikipedia.org/wiki/Low-level_programming_language

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