TypeScript and array reduce function

Question

Do you know what does array

reduce

function do in TypeScript?
Can you provide a simple example of usage?

I search on Google and TypeScript language specification but could not find any decent explanation and examples.

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Answer 1

It's actually the JavaScript array reduce function rather than being something specific to TypeScript.

As described in the docs: Apply a function against an accumulator and each value of the array (from left-to-right) as to reduce it to a single value.

Here's a TypeScript example which sums up the values of an array:

total = [0, 1, 2, 3].reduce((a, b) => a + b);
alert(total);

The alert box will show 6.

TypeScript and array reduce function

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