when looking at the lodash source code, there is such a judgment when you see the createSet function Set & & (1 / setToArray (new Set ([,-0]) [1]) = = INFINITY I don"t quite understand the second half of (1 / setToArray (new Set ([,-0])) [1]) = INFINITY meaning
const createSet = (Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY)
? (values) => new Set(values)
: () => {} for Set , there is a difference between -0 and + 0 , but the specification specifies that-0 and + 0 are equal after es2015. There is a browser compatibility problem. If the standard is followed, new Set ([,-0]) [1] returns 0 , otherwise it returns -0 , and the result of 1 /-0 is -Infinity does not mean that Infinity, uses empty objects as an alternative implementation of the standard Set at this time,
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