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  • function pairs(target_value, array) {
      array.map(i => { array.map(j => {
       (i !== j && array[i] === array[j])? 1 : 0
        })
      })
    }
      
     //shorter way to write what you wrote
    • function pairs(target_value, array) {
    • var num_elements = array.length;
    • array.map(i => { array.map(j => {
    • (i !== j && array[i] === array[j])? 1 : 0
    • })
    • })
    • }
    • for ( var i = 0; i < num_elements; i++ ) {
    • for ( var j = 0; j < num_elements; j++ ) {
    • if ( i !== j && array[i] === array[j] ) {
    • return -1;
    • }
    • }
    • }
    • return 0;
    • }
    • //shorter way to write what you wrote