javascript string array reduce code example
Example 1: reduce an array of objects to string
var authors = [{
name: "a"
}, {
name: "b"
}, {
name: "c"
}];
var result = authors.reduce(function(author, val, index) {
var comma = author.length ? ", " : "";
return author + comma + val.name;
}, '');
console.log(result);
Example 2: reduce method
The reduce() method executes a reducer function (that you provide) on each element of the array, resulting in single output value.
The reducer function takes four arguments:
Accumulator (acc)
Current Value (cur)
Current Index (idx)
Source Array (src)
arr.reduce(callback( accumulator, currentValue, [, index[, array]] )[, initialValue])
let flattened = [[0, 1], [2, 3], [4, 5]].reduce(
( accumulator, currentValue ) => accumulator.concat(currentValue),
[]
)