charAt()

charAt() always returns string. charAt() is full meaning character charAt() all time provide index of number below code example…

concat()

concat() it use many purpose. It work like push() method. push() method use that any string or number into end of the array. Same concat()…

endsWith()

endWith() method determine string end of the charcter. endWith() method all time provide and match last word and number.endWith()provide always true or false.If last word and number match provide true otherwise provide false.

indexOf()

indexOf() method always provide string.indexOf() use for any position have or have not.If index position seach find provide index position otherwise -1 

lastIndexOf()

lastIndexOf() always provide a string.lastIndexOf means if a sentence into  lot of same word,lastIndex do count last word index.

replace()

replace() method use any replact word and string or number.replace() method replace mached word or string.

Boolean

JavaScript function have boolean type method.Boolean function provide always true or false converte any type method

Variables

JavaScript have variables.Variables into have 3 type of variables difine var, const ,let

Operators

JavaScript's numeric operators are +, -, *, / and % which is the remainder operator (which is the same as modulo.)

Objects

JavaScript objects can be thought of as simple collections of name-value pairs. As such, they are similar to