merge: Upgrade Lower function #894

Original file line number	Diff line number	Diff line change
		@@ -1,8 +1,8 @@
		/**
		* @function lower
		* @description Will convert the entire string to lowercase letters.
	* @param {String} url - The input URL string
	* @return {String} Lowercase string
	* @param {String} str - The input string
	* @returns {String} Lowercase string
		* @example lower("HELLO") => hello
		* @example lower("He_llo") => he_llo
		*/
Expand All		@@ -12,17 +12,12 @@ const lower = (str) => {
		throw new TypeError('Invalid Input Type')
		}

	let lowerString = ''
	return str
	.replace(/[A-Z]/g, (_, indexOfUpperChar) => {
	const asciiCode = str.charCodeAt(indexOfUpperChar)

	for (const char of str) {
	let asciiCode = char.charCodeAt(0)
	if (asciiCode >= 65 && asciiCode <= 90) {
	asciiCode += 32
	}
	lowerString += String.fromCharCode(asciiCode)
	}

	return lowerString
	return String.fromCharCode(asciiCode + 32)
	})
		}

		export { lower }

18 changes: 14 additions & 4 deletions String/test/Lower.test.js

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Original file line number	Diff line number	Diff line change
		@@ -1,9 +1,19 @@
		import { lower } from '../Lower'

	describe('Lower', () => {
	it('return uppercase strings', () => {
	expect(lower('hello')).toBe('hello')
	describe('Testing the Lower function', () => {
	it('Test 1: Check by invalid type', () => {
	expect(() => lower(345)).toThrowError()
	expect(() => lower(true)).toThrowError()
	expect(() => lower(null)).toThrowError()
	})

	it('Test 2: Check by uppercase string', () => {
		expect(lower('WORLD')).toBe('world')
	expect(lower('hello_WORLD')).toBe('hello_world')
	expect(lower('Hello_WORLD')).toBe('hello_world')
	})

	it('Test 3: Check by lowercase string', () => {
	expect(lower('hello')).toBe('hello')
	expect(lower('hello_world')).toBe('hello_world')
		})
		})

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