# What sort of matchers can I use on my expect calls?

```javascript
const earth = { round: true }
const globe = { round: true }
const fish = { round: false }
const egg = undefined
const age = 43
const max = 83
const names = ['asad', 'mladen', 'ben', 'roger', 'ardit', 'alexis']

describe('the behaviour of the Jasmine matchers', () => {

  it('should implement toBe correctly', () => {
    expect(earth.round).toBe(true)
    expect(earth).not.toBe(globe)
  })    

  it('should implement toEqual correctly', () => {
    expect(earth).toEqual(globe)
    expect(earth).not.toEqual(fish)  
  })

  it('should implement toBeDefined correctly', () => {
    expect(earth).toBeDefined()
    expect(egg).not.toBeDefined()  
  })

  it('should implement toBeTruthy correctly', () => {
    expect(earth).toBeTruthy()
    expect(egg).not.toBeTruthy()  
  })

  it('should implement toBeFalsey correctly', () => {
    expect(earth).not.toBeFalsy()
    expect(egg).toBeFalsy() 
  })

  it('should implement toBeGreaterThan correctly', () => {
    expect(max).toBeGreaterThan(age)
    expect(age).not.toBeGreaterThan(max)
  })

  it('should implement toBeLessThan correctly', () => {
    expect(age).toBeLessThan(max)
    expect(max).not.toBeLessThan(age)
  })

  it('should implement toContain correctly', () => {
    expect(names).toContain('ben')
    expect(names).not.toContain('robin')
  })

  it('should implement toBeCloseTo correctly', () => {
    expect(3.1415).toBeCloseTo(3.14, 2)
    expect(3.1415).not.toBeCloseTo(3.15, 2)    
  })

  it('should implement jasmine.any() correctly', () => {
    expect([]).toEqual(jasmine.any(Array))
    expect(() => {}).toEqual(jasmine.any(Function))
  })

})
```


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