I’m trying to combine the slice [1, 2] and the slice [3, 4]. How can I do this in Go? I tried: append([]int{1,2}, []int{3,4}) but got: cannot use []int literal (type []int) as type int in append However, the documentation seems to indicate this is possible, what am I missing? slice = append(slice, anotherSlice…) 9 … Read more
How do I efficiently append one string to another? Are there any faster alternatives to: var1 = “foo” var2 = “bar” var3 = var1 + var2 1Best Answer 11 If you only have one reference to a string and you concatenate another string to the end, CPython now special cases this and tries to extend … Read more
There’s insertBefore() in JavaScript, but how can I insert an element after another element without using jQuery or another library? 19 s 19 referenceNode.parentNode.insertBefore(newNode, referenceNode.nextSibling); Where referenceNode is the node you want to put newNode after. If referenceNode is the last child within its parent element, that’s fine, because referenceNode.nextSibling will be null and insertBefore … Read more
How do I create an empty DataFrame, then add rows, one by one? I created an empty DataFrame: df = pd.DataFrame(columns=(‘lib’, ‘qty1’, ‘qty2’)) Then I can add a new row at the end and fill a single field with: df = df._set_value(index=len(df), col=”qty1″, value=10.0) It works for only one field at a time. What is … Read more
This question already has answers here: jQuery document.createElement equivalent? (14 answers) Closed 4 years ago. How do I create a div element in jQuery? 2 24 As of jQuery 1.4 you can pass attributes to a self-closed element like so: jQuery(‘<div>’, { id: ‘some-id’, class: ‘some-class some-other-class’, title: ‘now this div has a title!’ }).appendTo(‘#mySelector’); … Read more
To redirect standard output to a truncated file in Bash, I know to use: cmd > file.txt To redirect standard output in Bash, appending to a file, I know to use: cmd >> file.txt To redirect both standard output and standard error to a truncated file, I know to use: cmd &> file.txt How do … Read more
This question’s answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. How do I append an object (such as a string or number) to an array in JavaScript? 30 30 Use the Array.prototype.push method to append values to the end of an array: … Read more
How do you append to the file instead of overwriting it? Is there a special function that appends to the file? 1 13
This question’s answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. What’s the difference between the list methods append() and extend()? 20
StringBuilder sb = new StringBuilder(); for(int i=0;i<100;i++){ sb.insert(0, Integer.toString(i)); } Warning: It defeats the purpose of StringBuilder, but it does what you asked. Better technique (although still not ideal): Reverse each string you want to insert. Append each string to a StringBuilder. Reverse the entire StringBuilder when you’re done. This will turn an O(n²) solution … Read more
