# Some useful technique of using Number and String in JavaScript

JavaScript is a lightweight, interpreted programming language.

Number: Number is a type in javaScript. The range of number value is= From (253 − 1) to 253–1.

The largest positive number in JavaScript = (253–1).

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The largest positive number in JavaScript = –(253–1).

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infinity and Infinity number

JavaScript has infinity and Infinity number:

Infinity number = 1/0 ,

-Infinity number = -1/0

Topics are:

Convert to another type

We can convert any other types of number value to an integer value. Example:

§ Convert binary to decimal number =

§ Convert string to number=

§ Convert octal to number:

Math.abs(x)

We can find the absolute value of a number using Math.abs

Math.ceil(x) , Math.floor(x)

To get the upper and lower integer value of a floating-point number, use ceil and floor

Math.max(x,y,…), Math.min(x,y,…)

Find the minimum and maximum number from numbers =

Find the minimum and maximum number from an Array =

We can find the minimum number in the same way.

Math.random()

We can find a random number in an array. To find a random number

Math.round()

We can find around value. The Math.round() function returns the value of a number rounded to the nearest integer.

Math.sqrt()

The Math.sqrt() function returns the square root of a number. Sqr value is the root value of a number. We can find it by using sqrt(). But it must be a number.

String:

A string is a data type used in programming language. It is a set of characters that can also contain spaces and numbers.

Topics are:

String values have to put in “ ” / ‘ ’/` `.

Example:

concat()

It is used to add to a string

includes(word)

includes is used to check if the word is there or not.

indexOf(“word”)

to find the position of the word or letter.

sentence.replace(‘the_word_to_be_replaced’,’replaced_word’))

To replace a word or sentence. Example:

String.substr(position1,position2)

String.trim()

Trim removes all space, tab, break space, etc.