Integration formula

An integral is the area under a function’s curve. Take a look at this image: The area of the darker colored section is called the integral of f(x) in the…

Limits Of Functions

a limit is the value that a function approaches some value. In formulas, a limit is usually written as and is read as “the limit of f of x as x approaches a equals L”. Rules for Limits:…

Secant and Tangent Lines

A secant line is a straight line joining two points on a function. It is also equivalent to the average rate of change, or simply the slope between two points. A tangent line is a straight line…

Trigonometric formula

Trigonometry is a branch of mathematics that studies relationships involving lengths and angles of triangles (Wikipedia). There are six main trigonometric functions: Sine (sin) Cosine (cos) Tangent (tan) Secant (sec) Cosecant (csc) Cotangent (cot) Trigonometric formula…

Logarithm formula

The Logarithm is the inverse function to exponentiation. That means the logarithm of a given number x is the exponent to which another fixed number, the base b, must be…

Safest way when using for .. in to loop through an array or object in Javascript

There are so many ways to loop through an array or object in Javascript, one of them is using for .. in. For example:

It looks correct, right? But…