Commit ba49c93

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Merge pull request #60 from khusbuchandra/develop

Issue #45 : Add isNegativeInteger function

2 parents 31783c6 + 881dfb9 commit ba49c93Copy full SHA for ba49c93

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Original file line number	Diff line number	Diff line change
`@@ -25,4 +25,5 @@ module.exports = Object.assign(`
`25`	`25`	`require('./lib/sampleVariance.js'),`
`26`	`26`	`require('./lib/isPositiveInteger.js'),`
`27`	`27`	`require('./lib/isDecimal.js'),`
	`28`	`+ require('./lib/isNegativeInteger.js'),`
`28`	`29`	`);`

Lines changed: 16 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,16 @@`
	`1`	`+exports.isNegativeInteger = (...params) => {`
	`2`	`+ for (const param of params) {`
	`3`	`+ // Checks the type to be Number`
	`4`	`+ if (Object.prototype.toString.call(param) !== '[object Number]' \|\|`
	`5`	`+ // Is it an integer?`
	`6`	`+ param % 1 !== 0 \|\|`
	`7`	`+ // Is it positive?`
	`8`	`+ param >= 0 \|\|`
	`9`	`+ // maximum safe integer check`
	`10`	`+ // / / https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MAX_SAFE_INTEGER`
	`11`	`+ param < Number.MIN_SAFE_INTEGER) {`
	`12`	`+ return false;`
	`13`	`+ }`
	`14`	`+ }`
	`15`	`+ return true;`
	`16`	`+};`

Lines changed: 29 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,29 @@`
	`1`	`+const { isNegativeInteger } = require('../lib/isNegativeInteger');`
	`2`	`+`
	`3`	`+const MAX_SAFE_INTEGER = 9007199254740991;`
	`4`	`+describe('IsNegativeInteger', () => {`
	`5`	`+ it('should return false for positive integers or 0', () => {`
	`6`	`+ expect(isNegativeInteger(2, 4, 200)).toBe(false);`
	`7`	`+ expect(isNegativeInteger(MAX_SAFE_INTEGER, 4, 200)).toBe(false);`
	`8`	`+ expect(isNegativeInteger(0, 98, 225, 56)).toBe(false);`
	`9`	`+ });`
	`10`	`+`
	`11`	`+ it('should return true for negative numbers', () => {`
	`12`	`+ expect(isNegativeInteger(-3, -4, -200)).toBe(true);`
	`13`	`+ expect(isNegativeInteger(-34, -98, -225, -56)).toBe(true);`
	`14`	`+ });`
	`15`	`+`
	`16`	`+ it('should return false for floats', () => {`
	`17`	`+ expect(isNegativeInteger(2.6, 4.9, 23.67)).toBe(false);`
	`18`	`+ expect(isNegativeInteger(2, 4, 23.67)).toBe(false);`
	`19`	`+ expect(isNegativeInteger(-10.2, -4.6, -200.4)).toBe(false);`
	`20`	`+ expect(isNegativeInteger(-32.7, 98, 225, 56)).toBe(false);`
	`21`	`+ });`
	`22`	`+`
	`23`	`+ it('should return false for other values', () => {`
	`24`	`+ expect(isNegativeInteger({})).toBe(false);`
	`25`	`+ expect(isNegativeInteger(2, [])).toBe(false);`
	`26`	`+ expect(isNegativeInteger(1, 'S')).toBe(false);`
	`27`	`+ expect(isNegativeInteger(MAX_SAFE_INTEGER + 1)).toBe(false);`
	`28`	`+ });`
	`29`	`+});`

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