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

1.Detailed introduction to the analysis of 44 JavaScript abnormal questions

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...

2.php array_map array_multisort efficiently handles multi-dimensional array sorting

Introduction: Implementation code for efficiently processing multi-dimensional array sorting using array_map and array_multisort.

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4.php array_map uses a custom function to process each value in the array

Introduction: This article mainly introduces the relevant information about php array_map using custom functions to process each value in the array. Friends in need can refer to

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jQuery filtering array usage of grep, each, inArray, map and traversing json objects

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php array_map array_multisort efficiently handles multi-dimensional array sorting

Introduction: Implementation code for efficiently processing multi-dimensional array sorting using array_map and array_multisort.

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A brief analysis of the comparison of the use of array_map and array_walk in php

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8.

array_map/array_filter/array_walk traverses the array in the same way as foreach, who Want it faster?

Introduction: array_walk is equivalent to foreach: {code...} For example, remove the white space before and after the array $arr element: {code...} PHP array mapping simplification (MapReduce): {code...} array_reduce: Use the callback function to iteratively reduce the array into a single value //Output 16, which is 10+1+2+3, where...

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Introduction:: This article mainly introduces ThinkPHP--SQL query statement, if you are interested in PHP tutorials Students can refer to it.

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array_map/array_filter/array_walk traverses the array in the same way as foreach. Who wants to be faster?

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