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sommilito-bank2
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splide-4.1.3
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src
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js
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utils
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function
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apply
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import { apply } from './apply'; describe( 'apply', () => { test( 'can bind arguments to the function.', () => { function sum( a: number, b: number, c = 0, d = 0 ): number { return a + b + c + d; } // The type should be ( b: number, c?: number, d?: number ) => number. const sum1 = apply( sum, 1 ); const sum2 = apply( sum, 1, 1 ); const sum3 = apply( sum, 1, 1, 1 ); const sum4 = apply( sum, 1, 1, 1, 1 ); expect( sum1( 1, 1, 1 ) ).toBe( 4 ); expect( sum2( 1, 1 ) ).toBe( 4 ); expect( sum3( 1 ) ).toBe( 4 ); expect( sum4() ).toBe( 4 ); expect( sum1( 2 ) ).toBe( 3 ); // 1, 2, 0, 0 expect( sum1( 2, 2 ) ).toBe( 5 ); // 1, 2, 2, 0 expect( sum1( 2, 2, 2 ) ).toBe( 7 ); // 1, 2, 2, 2 } ); } );