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Let's begin with set 6, 13)Given an array of integer nums and an integer target, return indices of the two numbers such that they add up to the target. Assumptions:  Each input would have exactly one solution, and you may not use the same element twice. Example 1: Input: nums = [2,7,11,15], target = 9 Output: [0,1] Output: Because nums[0] + nums[1] == 9, we return [0, 1]. Example 2: Input: nums = [3,2,4], target = 6 Output: [1,2] Solution: const twoSum = (nums, target) => {   const map = {};   for (let i = 0; i < nums.length; i++) {     const another = target - nums[i];     if (another in map) {       return [map[another], i];     }     map[nums[i]] = i;   }   return null; }; You may also like these articles:   Coding Interview Set 1     Coding Interview Set 2 .     Coding Interview Set 3   Coding Interview Set 4 14)Given an array of numbers containing n distinct numbers in the range [0, n], return the only number in the range that is missing from the array. Could you impleme

This article is a sample code to generate an excel file with multiple tabs using  excel4node  module. Install: npm i excel4node Let's see the sample code, var excel = require( 'excel4node' ); // Create a new instance of a Workbook class var workbook = new excel.Workbook(); // Add Worksheets to the workbook var worksheet = workbook.addWorksheet( 'Buy order types' ); var worksheet1 = workbook.addWorksheet( 'Sell order types' ); // Style for headers var style = workbook.createStyle({ font : { color : '#EA3A14' , size : 18 }, numberFormat : '$#,##0.00; ($#,##0.00); -' }); var styleForData = workbook.createStyle({ font : { color : '#47180E' , size : 12 }, alignment : { wrapText : true , horizontal : 'center' , }, numberFormat : '$#,##0.00; ($#,##0.00); -' }); let buyOrderTypes = [ {name : "buy" ,id : "1" ,comment : "Normal