Quickly finding objects in large arrays
Finding an object with a specific property is slow in large arrays. We can speed this operation up significantly by transforming the array to a lookup object.
Read fire tipThe exponentiation operator
Math.pow() raises a base to an exponent. The recently introduced “exponentiation operator” ** does the same but shorter.
// we can use `Math.pow(x, y)` to calculate x^y
Math.pow(2, 2) // ⇒ 2 ^ 2 = 4
Math.pow(4, 3) // ⇒ 3 ^ 3 = 64
Math.pow(25, 0.5) // ⇒ 25 ^ 0.5 = 5
// `x ** y` does the same, but shorter
2 ** 2 // ⇒ 2 ^ 2 = 4
4 ** 3 // ⇒ 4 ^ 3 = 64
25 ** 0.5 // ⇒ 25 ^ 0.5 = 5