There’s no standard function for this, but you can define bool prefix(const char *pre, const char *str) { return strncmp(pre, str, strlen(pre)) == 0; } We don’t have to worry about str being shorter than pre because according to the C standard (7.21.4.4/2): The strncmp function compares not more than n characters (characters that follow … Read more
The strings package has what you are looking for. Specifically the HasPrefix function: http://golang.org/pkg/strings/#HasPrefix Example: fmt.Println(strings.HasPrefix(“my string”, “prefix”)) // false fmt.Println(strings.HasPrefix(“my string”, “my”)) // true That package is full of a lot of different string helper functions you should check out.
String.prototype.startsWith is a standard method in the most recent version of JavaScript, ES6. Looking at the compatibility table below, we can see that it is supported on all current major platforms, except versions of Internet Explorer. ╔═══════════════╦════════╦═════════╦═══════╦═══════════════════╦═══════╦════════╗ ║ Feature ║ Chrome ║ Firefox ║ Edge ║ Internet Explorer ║ Opera ║ Safari ║ ╠═══════════════╬════════╬═════════╬═══════╬═══════════════════╬═══════╬════════╣ ║ … Read more
puts ‘abcdefg’.start_with?(‘abc’) #=> true [edit] This is something I didn’t know before this question: start_with takes multiple arguments. ‘abcdefg’.start_with?( ‘xyz’, ‘opq’, ‘ab’)
Use rfind overload that takes the search position pos parameter, and pass zero for it: std::string s = “tititoto”; if (s.rfind(“titi”, 0) == 0) { // pos=0 limits the search to the prefix // s starts with prefix } Who needs anything else? Pure STL! Many have misread this to mean “search backwards through the … Read more
You can use ECMAScript 6’s String.prototype.startsWith() method, but it’s not yet supported in all browsers. You’ll want to use a shim/polyfill to add it on browsers that don’t support it. Creating an implementation that complies with all the details laid out in the spec is a little complicated. If you want a faithful shim, use … Read more