从所有数组项切片字符

Question

我有一个数组

myArray = ['A123000','A234000','A456000']

我想从每个数组项中切出前4个字符，因此输出如下所示：

['A123','A234','A456']

我尝试了这个，但它不喜欢数组 - 我错过了每个或什么？救命啊！

myArray.slice(0,3); 

Answer 1

在slice内为每个元素使用相同的map

var output = myArray.map( s => s.slice(0,4) ) 

或substring

var output = myArray.map( s => s.substring(0,4) ) 

Answer 2

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let myArray = ['A123000','A234000','A456000'];

let newArray = myArray.map(a => a.slice(0,4) );

console.log( newArray );

＆＃13;

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Answer 3

您可以使用.map，然后在每个元素上使用.substring

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var arr = ['A123000','A234000','A456000'];
var sliced = arr.map(el => el.substring(0, 4));
console.log(sliced);

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Answer 4

尝试以下

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    let myArray = ['A123000','A234000','A456000'];
    
    result = myArray.map(a => a.slice(0,4) );
    console.log( result );

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