Problem statement（题目原文）
Given:
const a = 1;
const b = '1';
What is the result of each of the following statements?
a == b
a === b
!a === !b
a + b
a + +b
Brief idea
Know == performs coercion (string → number), === doesn’t; + concatenates when a string is involved; unary + coerces to number.
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