findIndex is not a function 这个错误通常出现在尝试在一个不支持 findIndex 方法的对象上调用它时。findIndex 是JavaScript 数组的一个方法,用于找出数组中满足提供的测试函数的第一个元素的索引。如果不满足使用条件,就会抛出这个错误。下面我将根据提示逐一分析可能导致这个错误的原因,并提供相应的解决方案。 确认...
arr.forEach(function(item,index){ console.log(item); }); 1. 2. 3. 4. 这个方法是没有返回值的,仅仅是遍历数组中的每一项,不对原来数组进行修改; 但是可以自己通过数组的索引来修改原来的数组; var ary = [12,23,24,42,1]; var res = ary.forEach(function (item,index,input) { input[index...
问vue findIndex不是函数ENfind 返回符合条件的第一个元素 如果没有符合条件的元素则返回 undefined ...
myFind = function (callbackFn, thisArg) { // 判断callbackFn类型,非函数报错 if (typeof callbackFn !== 'function') { throw new TypeError(`${typeof callbackFn} is not a function`) } // 稀疏数组中,未赋值的空槽和undeifned表现相同 let i = 0 let len = this.length while (i < ...
How to set the correct timezone to get a isoformat datetime string in Python? I need to assign to a variable the current datetime string in isoformat like the following: What I'm doing is: But this is going to print the string with utc tz: Not clear yet to me what's the clean w...
Thrown if predicate does not return true for any element.Return ValueThe index of the first element in the array that satisfies the given predicate.RemarksThis function is named FindIndex in compiled assemblies. If you are accessing the function from a language other than F#, or through reflecti...
Create a typescript file Run the below code The methodfindIndexon an array, will throw a TS error: [ts] Property 'findIndex' does not exist on type 'IDropdownValue[]'. [2339] interfaceIProps{data:IDropdownValue[];}interfaceIDropdownValue{label:string;}consttestFunction=(props:IProps)...
Note: The findIndex() method is not supported in Internet Explorer 11 and earlier versions.Syntaxarray.findIndex(function(currentValue,index,arr),thisValue)Parameter ValuesParameterDescription function(currentValue, index,arr) Required. A function to be run for each element in the array.Function ...
if (!Array.prototype.findIndex) { Object.defineProperty(Array.prototype, 'findIndex', { value: function(predicate) { if (this == null) { throw new TypeError('"this" is null or not defined'); } var o = Object(this); var len = o.length >>> 0; if (typeof predicate !== 'functi...
// Default:[1,5,10,15].findIndex(function(a){returna>9;})// 2 License The MIT License (MIT) Copyright (c) 2013 Paul Millerhttp://paulmillr.com Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Soft...