Page 102 - JavaScript

var arr = [4, 2, 1, -10, 9]

arr.reduce(function(a, b) {
return a < b ? a : b
}, Infinity);
// → -10

6

Find Unique Values

Here is an example that uses reduce to return the unique numbers to an array. An empty array is
passed as the second argument and is referenced by prev.

var arr = [1, 2, 1, 5, 9, 5];

arr.reduce((prev, number) => {
if(prev.indexOf(number) === -1) {
prev.push(number);
}
return prev;
}, []);
// → [1, 2, 5, 9]

Logical connective of values

5.1

.some and .every allow a logical connective of Array values.

While .some combines the return values with OR, .every combines them with AND.

Examples for .some

[false, false].some(function(value) {
return value;
});
// Result: false

[false, true].some(function(value) {
return value;
});
// Result: true

[true, true].some(function(value) {
return value;
});
// Result: true

And examples for .every

[false, false].every(function(value) {
return value;

https://riptutorial.com/ 59