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Suppose, we have a string that contains some capitalized English alphabets like this −const str = "Connecting to server Connection has been successful We found result";We are required to write a JavaScript function that takes in one such string and inserts a comma ', ' before the space before every capital letter in the string.The code for this will be −const str = "Connecting to server Connection has been successful We found result"; const capitaliseNew = str => { let newStr = ''; const regex = new RegExp(/.[A-Z]/g); newStr = str.replace(regex, ', $&'); return newStr; }; ... Read More
We are required to write a JavaScript function that takes in an array of numbers. The number should find the smallest element in the array and remove it in place.The code for this will be −const arr = [2, 1, 3, 2, 4, 5, 1]; const removeSmallest = arr => { const smallestCreds = arr.reduce((acc, val, index) => { let { num, ind } = acc; if(val >= num){ return acc; }; ind = index; num = val; return { ind, num }; }, { num: Infinity, ind: -1 }); const { ind } = smallestCreds; if(ind === -1){ return; }; arr.splice(ind, 1); }; removeSmallest(arr); console.log(arr);Following is the output on console −[ 2, 3, 2, 4, 5, 1 ]
Given a non-negative integer, we are required to write a function that returns an array containing a list of independent digits in reverse order.For example:348597 => The correct solution should be [7,9,5,8,4,3]The code for this will be −const num = 348597; const reverseArrify = num => { const numArr = String(num).split(''); const reversed = []; for(let i = numArr.length - 1; i >= 0; i--){ reversed[i] = +numArr.shift(); }; return reversed; }; console.log(reverseArrify(num));Following is the output on console −[ 7, 9, 5, 8, 4, 3 ]
We are required to write a JavaScript function that takes in an array of numbers that contains at least one duplicate pair of numbers.Our function should return the distance between all the duplicate pairs of numbers that exist in the array.The code for this will be −const arr = [2, 3, 4, 2, 5, 4, 1, 3]; const findDistance = arr => { var map = {}, res = {}; arr.forEach((el, ind) => { map[el] = map[el] || []; map[el].push(ind); }); Object.keys(map).forEach(el => { if (map[el].length > ... Read More
Suppose, we have a string that contains words separated by hyphens like this −const str = 'this-is-an-example';We are required to write a JavaScript function that takes in one such string and converts it into a camelCase string.For the above string, the output should be −const output = 'thisIsAnExample';The code for this will be −const str = 'this-is-an-example'; const changeToCamel = str => { let newStr = ''; newStr = str .split('-') .map((el, ind) => { return ind && el.length ? el[0].toUpperCase() + el.substring(1) : el; }) .join(''); return newStr; }; console.log(changeToCamel(str));Following is the output on console −thisIsAnExample
We are required to write a JavaScript function that takes in an array of Numbers as the first argument and a Number as the second argument.The function should return an array of two numbers from the original array whose sum is closest to the number provided as the second argument.The code for this will be −const arr = [1, 2, 3, 4, 5, 6, 7]; const num = 14; const closestPair = (arr, sum) => { let first = 0, second = 0; for(let i in arr) { for(let j in arr) { ... Read More
Suppose, we have an array of objects like this −const arr = [ {a:1, b:"apples"}, {a:3, b:"apples"}, {a:4, b:"apples"}, {a:1, b:"bananas"}, {a:3, b:"bananas"}, {a:5, b:"bananas"}, {a:6, b:"bananas"}, {a:3, b:"oranges"}, {a:5, b:"oranges"}, {a:6, b:"oranges"}, {a:10, b:"oranges"} ];We are required to write a JavaScript function that takes in one such array and returns an array of objects.The array should contain an object for each unique value of "b" property where the "a" property has the highest value.The code for this will be −const arr = [ {a:1, b:"apples"}, {a:3, ... Read More
We are required to write a JavaScript function that takes in a two-dimensional array and returns its transposed array.The code for this will be −Method 1: Using Array.prototype.forEach()const arr = [ [0, 1], [2, 3], [4, 5] ]; const transpose = arr => { const res = []; arr.forEach((el, ind) => { el.forEach((elm, index) => { res[index] = res[index] || []; res[index][ind] = elm; }); }); return res; }; console.log(transpose(arr));Method 2: Using Array.prototype.reduce()const arr = [ ... Read More
We are required to write a JavaScript function that takes in a hexadecimal color and returns its RGB representation.The function should return an object containing the respective values of red green and blue color −For example:hexToRgb('#0080C0') should return 0, 128, 192The code for this will be −const hex = '#0080C0'; const hexToRGB = hex => { let r = 0, g = 0, b = 0; // handling 3 digit hex if(hex.length == 4){ r = "0x" + hex[1] + hex[1]; g = "0x" + hex[2] + hex[2]; ... Read More
We are required to write a JavaScript function that takes in a RGB color and returns its hexadecimal representation.The function should take in an object containing three numbers representing the respective values of red green and blue color.For example:rgbToHex(0, 128, 192) should return '#0080C0'The code for this will be −const rgbColor = { red: 0, green: 51, blue: 155 } function rgbToHex({ red: r, green: g, blue: b }) { const prefix = '#'; const hex = prefix + ((1