Question

我有一个数组如下

[ 'test123', '', 'testabc' ]

如何根据此数组的数组索引创建数组。我想要的输出为[ '1', '0','1']。如果索引中有任何元素，则应该给出1，否则为0.在nodejs中生成这样的数组的最佳方法是什么。

Answer 1

您可以使用array#map

＆＃13;

var data = [ 'test123', '', 'testabc' ],
    result = data.map(v => v? '1' :'0');
console.log(result);

＆＃13;

Answer 2

最简单方法：

Error: Cannot assign to a reference or variable!
    at _AstToIrVisitor.visitPropertyWrite (webpack-internal:///../../../compiler/esm5/compiler.js:26550:23)
    at PropertyWrite.visit (webpack-internal:///../../../compiler/esm5/compiler.js:4895:24)
    at convertActionBinding (webpack-internal:///../../../compiler/esm5/compiler.js:26000:45)
    at eval (webpack-internal:///../../../compiler/esm5/compiler.js:28519:22)
    at Array.forEach (<anonymous>)
    at ViewBuilder._createElementHandleEventFn (webpack-internal:///../../../compiler/esm5/compiler.js:28515:18)
    at nodes.(anonymous function) (webpack-internal:///../../../compiler/esm5/compiler.js:27934:27)
    at eval (webpack-internal:///../../../compiler/esm5/compiler.js:28460:22)
    at Array.map (<anonymous>)
    at ViewBuilder._createNodeExpressions (webpack-internal:///../../../compiler/esm5/compiler.js:28459:56)
    at _AstToIrVisitor.visitPropertyWrite (webpack-internal:///../../../compiler/esm5/compiler.js:26550:23)
    at PropertyWrite.visit (webpack-internal:///../../../compiler/esm5/compiler.js:4895:24)
    at convertActionBinding (webpack-internal:///../../../compiler/esm5/compiler.js:26000:45)
    at eval (webpack-internal:///../../../compiler/esm5/compiler.js:28519:22)
    at Array.forEach (<anonymous>)
    at ViewBuilder._createElementHandleEventFn (webpack-internal:///../../../compiler/esm5/compiler.js:28515:18)
    at nodes.(anonymous function) (webpack-internal:///../../../compiler/esm5/compiler.js:27934:27)
    at eval (webpack-internal:///../../../compiler/esm5/compiler.js:28460:22)
    at Array.map (<anonymous>)
    at ViewBuilder._createNodeExpressions (webpack-internal:///../../../compiler/esm5/compiler.js:28459:56)
    at resolvePromise (webpack-internal:///../../../../zone.js/dist/zone.js:824:31)
    at resolvePromise (webpack-internal:///../../../../zone.js/dist/zone.js:795:17)
    at eval (webpack-internal:///../../../../zone.js/dist/zone.js:873:17)
    at ZoneDelegate.invokeTask (webpack-internal:///../../../../zone.js/dist/zone.js:425:31)
    at Object.onInvokeTask (webpack-internal:///../../../core/esm5/core.js:4944:33)
    at ZoneDelegate.invokeTask (webpack-internal:///../../../../zone.js/dist/zone.js:424:36)
    at Zone.runTask (webpack-internal:///../../../../zone.js/dist/zone.js:192:47)
    at drainMicroTaskQueue (webpack-internal:///../../../../zone.js/dist/zone.js:602:35)
    at <anonymous>

Answer 3

＆＃13;

var array = [ 'test123', '', 'testabc' ];
var newarray = []; 

array.forEach(function(item){
   if(item.length > 0) {
     newarray.push('1');
   } else {
       newarray.push('0');
    }
});

console.log(newarray);

＆＃13;

您可以使用for或forEach

循环遍历数组

如果长度大于0，我们推送值＆＃39; 1＆＃39;进入空数组叫做 newarray ，我们推动＆＃39; 0＆＃39;。

Answer 4

var array = [ 'test123', '', 'testabc' ];
var newarray = [];

array.forEach(function(item) { 
    if(item.trim().length > 0) { 
        newarray.push('1'); 
    }
    else {
        newarray.push('0'); 
    }
});
console.log(newarray);

Answer 5

您可以尝试这样的事情：

逻辑：

循环数组并将值转换为布尔值。您可以使用!!
然后将此布尔值转换为数字。 True将转换为1，false将转换为0。

var arr = [ 'test123', '', 'testabc' ];
var result = arr.map((x) => +!!x);
console.log(result)

基于数组索引创建新数组

5 个答案:

逻辑：