partial-x/test.js at master · interacsean/partial-x · GitHub

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const { _, X, partialX } = require('./index');

describe('partialX', function() {

  function subMult(nBase, nSub, nMult) {
    return (nBase - nSub) * nMult;
  }

  it('can partial first and last argument', () => {
    const expected = 15;

    const actual = partialX(subMult, [10, X, 3])

    const result = actual(5);

    expect(result).toEqual(expected);
  });

  it('can partial middle argument', () => {
    const expected = 15;

    const actual = partialX(subMult, [_, 5, _])

    const result = actual(10, 3);

    expect(result).toEqual(expected);
  });

  it('can leave off last argument', () => {
    const expected = 15;

    const actual = partialX(subMult, [_, 5])

    const result = actual(10, 3);

    expect(result).toEqual(expected);
  });

  it('can partial first arg as per normal partial', () => {
    const expected = 15;

    const actual = partialX(subMult, [10])

    const result = actual(5, 3);

    expect(result).toEqual(expected);
  });

});