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C++ 2022-02-26 16:45:35
string
#A string is a type of data. There are many data types. It can be manipulated. #It can be storerd as a variable myString = "Hello world" #WE can print it: print(myString) #You can append it to arraY: myArr = [] myArr.append(myString) #You can fi... Add solution -
Javascript 2022-02-19 10:35:24
array map
const myArray = ['Sam', 'Alice', 'Nick', 'Matt']; // Appends text to each element of the array const newArray = myArray.map(name => { return 'My name is ' + name; }); console.log(newArray); // ['My name is Sam', 'My Name is Alice', ...] // Appends ... Add solution -
C# 2022-02-17 18:15:26
indexof c#
// To find the index of the first substring in a string use // 'IndexOf()' string str = "Hello World!" str.IndexOf("o"); // Output: 4 // You can give a starting index and a length to search at str.IndexOf("o", 6, 4); // Outp... Add solution -
Javascript 2022-02-12 05:25:18
how to update specific key of an object in reducer
case COMPLETE_TODO: { const index = state.todos.findIndex(todo => todo.id === action.payload); //finding index of the item const newArray = [...state.todos]; //making a new array newArray[index].completed = true//changing value in the new array... Add solution -
Python 2022-02-10 00:00:20
python randomly shuffle rows of pandas dataframe
# Basic syntax: df = df.sample(frac=1, random_state=1).reset_index(drop=True) # Where: # - frac=1 specifies returning 100% of the original rows of the # dataframe (in random order). Change to a decimal (e.g. 0.5) if # you want to sample say, 50% of the... Add solution -
Javascript 2022-02-06 16:10:31
.index of javascript
//indexOf getting index of array element, returns -1 if not found var colors=["red","green","blue"]; var pos=colors.indexOf("blue");//2 //indexOf getting index of sub string, returns -1 if not found var str = "... Add solution -
Javascript 2022-02-02 21:05:25
how to find and remove object from array in javascript
// we have an array of objects, we want to remove one object using only the id property var apps = [{id:34,name:'My App',another:'thing'},{id:37,name:'My New App',another:'things'}]; // get index of object with id:37 var removeIndex = apps.map(function... Add solution -
Javascript 2022-02-02 20:50:35
react array find index
//The findIndex() method returns the index of the first element //in the array that satisfies the provided testing function. //Otherwise, it returns -1, indicating that no element passed the test. const array1 = [5, 12, 8, 130, 44]; const isLargeNumber ... Add solution