accept number from user and calculate the sum of all number between 1 and given number in

Define a function that a number n as parameter and returns the sum of the
numbers from 1 to n Javascript Program

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Given a string remove all + present together in the string. Javascript Program

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Input string =’a+++b++c+’; Output String=a+b+c+ Source Code

Given a string str, create a string consisting of all the non-alphabets and non-digits.

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JavaScript code