var str = 'hilly';
var value = str.includes('hi'); //true, even though the word 'hi' isn't found
var value = /\bhi\b/.test(str); //false - 'hi' appears but not as its own word
var str = "bonjour le monde vive le javascript";
var arr = ['bonjour','europe', 'c++'];
function contains(target, pattern){
var value = 0;
pattern.forEach(function(word){
value = value + target.includes(word);
});
return (value === 1)
}
console.log(contains(str, arr));
// test cases
const str1 = 'hi hello, how do you do?';
const str2 = 'regular string';
const str3 = 'hello there';
// do the test strings contain these terms?
const conditions = ["hello", "hi", "howdy"];
// run the tests against every element in the array
const test1 = conditions.some(el => str1.includes(el));
const test2 = conditions.some(el => str2.includes(el));
// strictly check that contains 1 and only one match
const test3 = conditions.reduce((a,c) => a + str3.includes(c), 0) == 1;
// display results
console.log(`Loose matching, 2 matches "${str1}" => ${test1}`);
console.log(`Loose matching, 0 matches "${str2}" => ${test2}`);
console.log(`Exact matching, 1 matches "${str3}" => ${test3}`);
var str1 = 'hi, how do you do?';
var str2 = 'regular string';
var conditions = ["hello", "hi", "howdy"];
// Solve the problem
var res1 = [str1].filter(data => data.includes(conditions[0]) || data.includes(conditions[1]) || data.includes(conditions[2]));
var res2 = [str2].filter(data => data.includes(conditions[0]) || data.includes(conditions[1]) || data.includes(conditions[2]));
console.log(res1); // ["hi, how do you do?"]
console.log(res2); // []
// More useful in this case
var text = [str1, str2, "hello world"];
// Apply some filters on data
var res3 = text.filter(data => data.includes(conditions[0]) && data.includes(conditions[2]));
// You may use again the same filters for a different check
var res4 = text.filter(data => data.includes(conditions[0]) || data.includes(conditions[1]));
console.log(res3); // []
console.log(res4); // ["hi, how do you do?", "hello world"]
let result
const givenStr = 'A, X' //values separated by comma or space.
const allowed = ['A', 'B']
const given = givenStr.split(/[\s,]+/).filter(v => v)
console.log('given (array):', given)
// given contains none or only allowed values:
result = given.reduce((acc, val) => {
return acc && allowed.includes(val)
}, true)
console.log('given contains none or only allowed values:', result)
// given contains at least one allowed value:
result = given.reduce((acc, val) => {
return acc || allowed.includes(val)
}, false)
console.log('given contains at least one allowed value:', result)
if (!String.prototype.contains) {
Object.defineProperty(String.prototype, 'contains', {
value(patterns) {
if (!Array.isArray(patterns)) {
return false;
}
let value = 0;
for (let i = 0; i < patterns.length; i++) {
const pattern = patterns[i];
value = value + this.includes(pattern);
}
return (value === 1);
}
});
}
允许您执行以下操作:
console.log('Hi, hope you like this option'.toLowerCase().contains(["hello", "hi", "howdy"])); // True