Detailed introduction to array_map function

When I did this set of questions, I not only doubted my IQ, but also my life... However, understanding the basic knowledge is the prerequisite for in-depth programming. Let us take a look at whether these perverted questions are perverted or not. !Question 1 ["1", "2", "3"].map(parseInt) Knowledge points: Array/mapNumber/parseIntJavaScript parseInt First, map accepts two parameters, a callback function callback, and a callback function's this value The callback function accepts three parameters: currentValue, index, array; and in the question, map only passes in the callback function – parseInt. Secondly, parseInt only accepts two parameters: string, radix (radix). Optional. Represents the base of the number to be parsed. The value is between 2 ~ 36. If this parameter is omitted or its value is 0, the number will be 10

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Introduction: When I did this set of questions, I not only doubted my IQ, but also my life... However, my understanding of basic knowledge is in-depth. The premise of programming. Let us take a look at whether these abnormal questions are abnormal or not! Question 1 ['1', '2', '3'].map(parseInt) Knowledge points: Array/map Number/parseInt JavaScript parseInt First, map accepts two parameters, a callback function callback, and a this value of the callback function. The callback...

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php array_map array_multisort efficiently handles multi-dimensional array sorting

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