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Visualizaçõesfind specific number in array for if statement
I know there are alot of questions like this on here but they keep pointing me to using includes and that is not working for me for some reason.
Goal - use an if statement to find out if a number exists in an array. (Don't care if its jQuery or plan JS)
I tried using includes but that failed:
testdata = [1,256]
testdata.includes(1) #or testdata.includes(256)
\\false
I also tried using indexof but that failed too:
testdata = [1,256]
testdata.indexOf('256') >= 0
\\false
3 Respostas
Responde à pergunta0
Indeed, it looks like your array [1,256] is the first element of testdata array. In fact, you can see that testdata length is 1.
You should check if testdata[0].includes(1)
0
Your array is numbers but your .indexOf argument is a string.
The snippet below works fine.
If you need true/false, use a conditional block like:
let numberFound = false;
if (testdata.indexOf(256)>-1) {
numberFound = true;
} else {
numberFound = false;
}
Instead of the full if/else block, it is more usual to condense the conditional using the ternary operator
like this:
numberFound = (testdata.indexOf(256) > -1) ? true : false)
finally, if you're testing several entries, use a function to return true/false depending on what was passed to it:
function numberFound(number,array) {
return (array.indexOf(number) > -1) ? true : false;
}
I've amended the snippet:
const testdata = [1,256]
console.log(testdata.indexOf(256));
console.log("test for 25: ", (testdata.indexOf(25) > -1) ? true : false);
console.log("test for 56: ", (testdata.indexOf(56) > -1) ? true : false);
console.log("test for 256: ", (testdata.indexOf(256) > -1) ? true : false);
function numberFound(number,array) {
return (array.indexOf(number) > -1) ? true : false;
}
console.log("function testing 256:", numberFound(256,testdata));
console.log("function testing 25:", numberFound(25,testdata));0
It is not working for you because you use it in the wrong way. # is the private identifier in JS. If you use // instead it works.
testdata = [1,256];
console.log(testdata.includes(1)); // or testdata.includes(256)