javascript-algorithms/src/utils/comparator/Comparator.js at master · codeorbit/javascript-algorithms · GitHub

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export default class Comparator {

/**

* @param {function(a: *, b: *)} [compareFunction]

constructor(compareFunction) {

this.compare = compareFunction || Comparator.defaultCompareFunction;

}

/**

* @param {(string|number)} a

* @param {(string|number)} b

* @returns {number}

static defaultCompareFunction(a, b) {

if (a === b) {

return 0;

}

return a < b ? -1 : 1;

}

equal(a, b) {

return this.compare(a, b) === 0;

}

lessThan(a, b) {

return this.compare(a, b) < 0;

}

greaterThan(a, b) {

return this.compare(a, b) > 0;

}

lessThanOrEqual(a, b) {

return this.lessThan(a, b) || this.equal(a, b);

}

greaterThanOrEqual(a, b) {

return this.greaterThan(a, b) || this.equal(a, b);

}

reverse() {

const compareOriginal = this.compare;

this.compare = (a, b) => compareOriginal(b, a);

}

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