# Tricks in JavaScript
# Array Distinct
var nums = [1, 1, 2, 2, 3, 3, 4, 5];
var unique = [...new Set(nums)];
console.log(unique);
// [1, 2, 3, 4, 5]
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# && & ||
&& returns a first false value, if all of them were true, then returns the last expression.
1 && 2 && 3 // 3
0 && null // 0
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|| returns a first true value, if all of them were false, then returns the last expression.
1 || 2 || 3 // 1
0 && null // null
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# Get last item in an array
let array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
console.log(array.slice(-1)); // Result: [9]
console.log(array.slice(-2)); // Result: [8, 9]
console.log(array.slice(-3)); // Result: [7, 8, 9]
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