return Archives - Simon Technology Blog

ReactJS – The valid React element (or NULL) must be returned. You may have returned undefined, array, or other invalid objects

I am new to ReactJS and I have a problem. I can’t solve it. Everything seems to be fine, but the console still lets me:

A valid React element (or null) must be returned. You may have
returne

October 21, 2021By Simo React Arrays, can, Elements, invalid, must, null, object, Other, React, Reactjs, return, Some, undefined, valid, You canLeave a Comment

Flex – What does this ActionScript syntax mean? (Return to the inline syntax)

I am a Java programmer and now need to deal with Flex/ActionScript projects. I got an example of ITreeDataDesriptor using Flex 3 Cookbook, but there is a line of ActionScript code that is difficult

October 20, 2021By Simo Flex ActionScript, Flex, grammar, Inline, meaning, object, return, This, whatLeave a Comment

Recurrent harmonic function returns NAN

I wrote the following sample code to find the harmonic value of N (1 1/2 1/3… 1 / N). Read the comments in the code written with BOLD, and Help me find why this happens.

#include
float harmo

October 17, 2021By Simo Mathematics functions, harmonics, nan, Recursive, returnLeave a Comment

4. Linear regression

import tensorflow as tf
import numpy as np
import matplotlib.pyplot as plt x_data = np.random.rand(100)
noise = np.random.normal(0,0.01,x_data.shape)
y_data = x_data*0.1 + 0.2 + noise

plt.

October 16, 2021By Simo Mathematics linear, returnLeave a Comment

Retall new variables based on GREP in R

I have a variable actor, which is a string containing values such as “Guinea-Bissau Military Forces (1989-1992)” and a large number of other different values that are quite complex. I have been

October 15, 2021By Simo Character Based on, encoding, Medium GREP, New, return, variableLeave a Comment

The data returned by the server will convert Unicode code to Chinese characters.

When we request the interface, the server will return some data. When we print it, we will find that the printed code is unicode, not Chinese characters.

At this time, we need to deal with it