1. 解释TypeError: reduce of empty array with no initial value错误的含义 这个错误通常出现在使用JavaScript的Array.prototype.reduce()方法时,当你试图对一个空数组进行归约操作,并且没有提供初始值(accumulator)时。reduce()方法需要一个初始值来开始累积操作,如果没有提供初始值,
您的 reducer 函数的返回值分配给累计器，该返回值在数组的每个迭代中被记住，并最后成为最终的单个结果值。如果数组为空且没有提供initialValue，会抛出错误TypeError: reduce of empty array with no initial value 可以通过添加initialValue来解决。详见： https://developer.mozilla.org/zh-CN/docs/Web/...
TypeError: reduce of empty array with no initial value Error type TypeError What went wrong? In JavaScript, there are several reduce functions: These functions optionally take aninitialValue(which will be used as the first argument to the first call of thecallback). However, if no initial val...
建议尽量提供初始值,以应对空数组的特殊情况。 Uncaught TypeError: Reduce of empty array with no initial value 2 reduce 的简单实现 要想真正理解这个神奇的 reduce 的运行机制,还得自己实现一下。这里我实现个简单的 reduce 方法: Array.prototype.myReduce = function(callbackFn, initVal) { const arr = ...
}// 如果kPresent是false,就报错if(kPresent ===false) {thrownewTypeError("Reduce of empty array with no initial value"); } }// 重复以下步骤,直到处理完了所有元素while(k < len) {// 把k转换成字符串,并叫做PkletPk=String(k);// 检查一下对象里有没有Pk这个属性,如果有,就把kPresent设为tr...
The JavaScript exception "reduce of empty array with no initial value" occurs when a reduce function is used.
Took 1.104 seconds to strip comments input bundle file /usr/local/lib/node_modules/react-monocle/src/previewParser.js:162 .reduce((prev, curr) => { ^ TypeError: Reduce of empty array with no initial value at Array.reduce (native) at getComponentName (/usr/local/lib/node_modules/react-...
Stacktrace: TypeError: Reduce of empty array with no initial value at Array.reduce (<anonymous>) at Object.children (https://xxx.yyy/main.a726808c41da12ea7cc9.js:2:1885533) at Ji.render (https://xxx.yyymain.a726808c41da12ea7cc9.js:2:1550799) at Hs (https://xxx.yyy/main.a726808c4...
raiseTypeError("reduce() of empty sequence with no initial value")fromNoneelse:value=initial# 对...