I need to search for the Number 7 within an Array and return true regardless of whether it's 7, 47, or 507.
The Array in question is: [17, 23, 9, 590]
My initial attempt was to use arr.includes(7) but this method only returns the specific number 7. This results in a false output because there is no exact match for 7 in the Array - only 17.
The issue lies in the comparison number === 7, it is recommended to compare each individual digit instead.
To do this, you can utilize the Array.prototype.some function along with the String.prototype.includes function to search for a specific digit or character.
This method successfully identifies the number 7 within each number's digits.
console.log([17, 23, 9, 590].some(n => String(n).includes(7)))To analyze the numbers, consider combining them and checking if the digit 7 is present.
var numbers = [17, 23, 9, 590],
includesSeven = numbers.join('').includes(7);
console.log(includesSeven);Is it possible to find the number that when divided by 10 has a remainder of 7?
const findByLeastSigFig = (arr, n) => arr.find(x => x % 10 === n);
console.log(findByLeastSigFig([17, 23, 9, 590], 7));To determine if the number 7 only appears in the last position, you can perform division by 10 and check the remainder.
const numbers = [7, 9, 17, 23, 57, 407, 590];
const filteredNumbers = numbers.filter(num => num % 10 === 7)
console.log(filteredNumbers)When faced with this problem, there are multiple correct solutions available to choose from. One of the most straightforward and efficient approaches is to utilize the Array.prototype.toString() method. This method concatenates the elements of the array into a single string, with each element separated by commas. For example, [17, 23, 9, 590].toString() will result in the string "17,23,9,590". To then locate the index of the number 7 within this string, you can employ the String.prototype.indexOf() method, which will return either the 0-based index of the search value or -1 if the value is not found.
In summary, the following line of code accomplishes these tasks:
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