**Contents**show

## What is a log in JavaScript?

log() is a function in JavaScript which is **used to print any kind of variables defined before in** it or to just print any message that needs to be displayed to the user. Syntax: console. log(A); Parameters: It accepts a parameter which can be an array, an object or any message.

## How do you do logs in JavaScript?

If you need a logarithm to base 2 or 10, **use Math.** **log2()** or Math. log10() . If you need a logarithm to other bases, use Math.

## How do you calculate log in math?

The power to which a base of 10 must be raised to obtain a number is called the common logarithm (log) of the number. The power to which the base e (e = 2.718281828…….)

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CALCULATIONS INVOLVING LOGARITHMS.

Common Logarithm | Natural Logarithm |
---|---|

log x/y = log x – log y | ln x/y = ln x – ln y |

log x^{y} = y log x |
ln x^{y} = y ln x |

## What are the log rules?

The rules apply for any **logarithm logbx**, except that you have to replace any occurence of e with the new base b. The natural log was defined by equations (1) and (2).

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Basic rules for logarithms.

Rule or special case | Formula |
---|---|

Quotient | ln(x/y)=ln(x)−ln(y) |

Log of power | ln(xy)=yln(x) |

Log of e | ln(e)=1 |

Log of one | ln(1)=0 |

## How are logarithms used in real life?

Much of the power of logarithms is their usefulness in solving **exponential equations**. Some examples of this include sound (decibel measures), earthquakes (Richter scale), the brightness of stars, and chemistry (pH balance, a measure of acidity and alkalinity).

## What is log method?

log() method **returns the natural logarithm (base e) of a double value as a parameter**. There are various cases : If the argument is NaN or less than zero, then the result is NaN. If the argument is positive infinity, then the result is positive infinity.

## Why ![] Is false?

![] evaluates to false **because the reference is truthy**. [] can be converted to an number (0 in this case) which is falsey. Therefore: the condition passes as equal.

## What is log in HTML?

log() method in HTML is **used for writing a message in the console**. It indicates an important message during testing of any program. The message is sent as a parameter to the console. log() method.

## How do you do ln in JavaScript?

To calculate the ln of a given number, **use the Math.** **log() method** in JavaScript. This method returns the natural logarithm (base E) of a number. If the value of a number is negative, the return value is always NaN.

## What is exponentiation in JavaScript?

The exponentiation operator ( ** ) **returns the result of raising the first operand to the power of the second operand**. It is equivalent to Math. pow , except it also accepts BigInts as operands.