object

问题 I have a PHP class called Product: class Product { $id; $name; } And another class that get data from database: $stm = $this->dsn->prepare($sql); $stm->execute(); $rst = $stm->fetchAll(PDO::FETCH_ASSOC); How can I convert this PDO resultset ($rst) to an array of objects Product? 回答1: Use the PDO::FETCH_CLASS argument. class Product { public $id; public $name; } $stm = $this->dsn->prepare($sql); $stm->execute(); $result = $stm->fetchAll( PDO::FETCH_CLASS, "Product" ); http://php.net/manual/en

问题 I'm attempting to join a list of wav files together into one audio file. So far this is what I have. I can't wrap my head around how to sum the objects together though since they are each an object. import glob, os from pydub import AudioSegment wavfiles = [] for file in glob.glob('*.WAV'): wavfiles.append(file) outfile = "sounds.wav" pydubobjects = [] for file in wavfiles: pydubobjects.append(AudioSegment.from_wav(file)) combined_sounds = sum(pydubobjects) #this is what doesn't work of

问题 This question already has answers here : Null check chain vs catching NullPointerException (19 answers) Check if last getter in method chain is not null (3 answers) Closed 3 years ago . I have an object and i want to check if this object or nested fields are null. I want to print this neted field, but i should check if there is null in some level, otherwise i will get null pointer exception . I know i can do this: if( object != null && object.A != null && object.A.B != null && object.A.B.C !=

问题 This question already has answers here : Null check chain vs catching NullPointerException (19 answers) Check if last getter in method chain is not null (3 answers) Closed 3 years ago . I have an object and i want to check if this object or nested fields are null. I want to print this neted field, but i should check if there is null in some level, otherwise i will get null pointer exception . I know i can do this: if( object != null && object.A != null && object.A.B != null && object.A.B.C !=

问题 This question already has answers here : Null check chain vs catching NullPointerException (19 answers) Check if last getter in method chain is not null (3 answers) Closed 3 years ago . I have an object and i want to check if this object or nested fields are null. I want to print this neted field, but i should check if there is null in some level, otherwise i will get null pointer exception . I know i can do this: if( object != null && object.A != null && object.A.B != null && object.A.B.C !=

问题 This question already has answers here : Null check chain vs catching NullPointerException (19 answers) Check if last getter in method chain is not null (3 answers) Closed 3 years ago . I have an object and i want to check if this object or nested fields are null. I want to print this neted field, but i should check if there is null in some level, otherwise i will get null pointer exception . I know i can do this: if( object != null && object.A != null && object.A.B != null && object.A.B.C !=

问题 The new object rest/spread syntax has some surprisingly nice applications, like omitting a field from an object. Is there a (proposed) way to also assign to several properties of an object, the values from variables with the same names? In other words, a shorter way to say: o.foo = foo; o.bar = bar; o.baz = baz; Note: Without losing the existing properties of o , only adding to them. 回答1: Use Object.assign : const o = { initial: 'initial' }; const foo = 'foo'; const bar = 'bar'; const baz =

问题 The new object rest/spread syntax has some surprisingly nice applications, like omitting a field from an object. Is there a (proposed) way to also assign to several properties of an object, the values from variables with the same names? In other words, a shorter way to say: o.foo = foo; o.bar = bar; o.baz = baz; Note: Without losing the existing properties of o , only adding to them. 回答1: Use Object.assign : const o = { initial: 'initial' }; const foo = 'foo'; const bar = 'bar'; const baz =

问题 I have an array of objects with the following structure: var arr = [ { "value": "abc", "checked": true }, { "value": "xyz", "checked": false }, { "value": "lmn", "checked": true } ]; let result = arr.filter(item => item.checked); console.log(result); I would want the output to be: ["abc", "lmn"] Because those two value s have checked: true . I have tried filtering out based on checked value: let result = arr.filter(item => item.checked); I am getting the objects that has checked property

问题 I use Object.freeze as a means to prevent myself from breaking my own rules. I would like Object.freeze to speak to me when I try to make a bad assignment. However, Object.freeze simply makes the assignments silently fail! For example, if I do /* * Frozen singleton object "foo". */ var foo = (function() { var me = {}; me.bar = 1; if (Object.freeze) { Object.freeze(me); } return me; })(); foo.bar = 2; console.log(foo.bar); the console will log "1", but I won't know that I ever made a bad